Pop before SMTP

Hi Guys,
I've recently moved from my Linux Mail Server to Leopard Server, and am now experiencing issues sending mails from outside my internal LAN.
Basically, I get the message: NOQUEUE, RCPT - relay access denied. I believe it's because it doesn't know that I am a trusted machine, and thus rejects the relay.
In an attempt to fix this problem, I had to get POP before SMTP installed as a workaround on the Linux machine few years back.
Any ideas on how I can change this with Leopard Server? Should I enable SSL? Should I enable MD5 Password or something? Or do I still need to install POP-before-SMTP?
Thanks for all your kind help in advance.

So, I've set SSL as "required", and also set CRAM-MD5, and basically I can see now that I can't receive any emails.
This really is one of the areas in which the Server Admin GUI lets you down.
If you set SSL as required, many remote servers won't be able to talk to you because they don't talk SSL by default. To enforce SSL for your users you really need a second port that forces SSL in addition to the standard port that doesn't.
You can do that, but only by delving in to Postfix's configuration files.
However, I've gotten something strange - I thought SMTP over SSL should default to 587. Why is it defaulted to 25 still? Do I need to add 587 somewhere else or something?
Ahh, the joys of ports.
There are two methods of implementing SSL with SMTP. One is SMTPS (which runs on port 465), the other is via TLS which uses the standard SMTP port. The difference is that SMTPS encrypts the entire connection (similar to HTTPS vs. HTTP), whereas TLS starts off with a non-encrypted connection and switches to secure once both client and server agree to use it (the client identifies itself, the server states it can use TLS, the client initiates a TLS session).
TLS is the model supported by Postfix, and that's why you still use port 25
Port 587 is the submission port. The line between 25 and 587 is pretty blurry, but many people implement different access controls and/or process rules for port 587 and have local users use that, leaving port 25 for non-local mail. Both ports can support TLS but you need to get under the hood to configure it.

Similar Messages

  • Pop before smtp and smtp auth

    Hi Jay,
    hope all is well with you.
    what is pop before smtp and how to see if it is enabled?
    what is smtp auth and how to see if it is enabled? Is it enabled by default on MS 6.x?
    what happens if smtp auth is not enabled? Will my mail server be a relay?
    Is there any additional configuration that should be done on messaging server to allow connection for dial-up users?
    thanks,

    Hi Jay,
    hope all is well with you.
    what is pop before smtp and how to see if it is
    enabled?Pop before SMTP is a very old, and little used method for "authenticating" users. There is virtually no reason to turn this on, anymore.
    It's done through the MMP, and is the only reason to actually use the SMTP proxy that's part of MMP.
    I would not go there unless your environment requires it. Most do not. Most clients support SMTP authentication, which is much better, and is on by default.
    >
    what is smtp auth and how to see if it is enabled? Is
    it enabled by default on MS 6.x?See above. Yes, smtp authentication is on by default.
    >
    what happens if smtp auth is not enabled? Will my
    mail server be a relay?Totally different issue.
    No.
    If smtp auth is off, if you have external users, they likely will not be allowed to send to other external users..
    >
    Is there any additional configuration that should be
    done on messaging server to allow connection for
    dial-up users?If "dial-up users" means that they come from ip addresses outside your network, then smtp auth will allow them full access.
    thanks,

  • How to satisfy POP-before-SMTP outgoing authentication?

    When using a third party email account (i.e. included with my website hosting account), I am unable to send email. The outgoing server auth method used on my host server is POP-before-SMTP. However, in the iphone settings, there are only 4 choices:[ MD5 C-R // NTLM // HTTP MD5 Digest // Password ] Having set POP or IMAP every 15 minutes is sufficient interval to satisfy ... no problem there ... there doesn't need to be a specific choice for pop-before-smtp, but there does not appear to be a way to choose NO authentication at all for SMTP?
    (i.e. with some computer email programs which do not support POP-before_SMTP, we turn outgoing authentication to OFF and ensure that email is retrieved on a regular schedule < 20 minutes, and all works perfectly.) For example, the Android Xperia has a NONE setting for SMTP auth.
    There's no choice for either pop-before-smtp nor OFF on the iphone.
    Can anyone suggest an app [or is it possible to hack] that would give us this functionality ?
    We know we could use our carrier's SMTP, but we want BOTH our incoming/outgoing mail handled on our hosting server.

    So, I've set SSL as "required", and also set CRAM-MD5, and basically I can see now that I can't receive any emails.
    This really is one of the areas in which the Server Admin GUI lets you down.
    If you set SSL as required, many remote servers won't be able to talk to you because they don't talk SSL by default. To enforce SSL for your users you really need a second port that forces SSL in addition to the standard port that doesn't.
    You can do that, but only by delving in to Postfix's configuration files.
    However, I've gotten something strange - I thought SMTP over SSL should default to 587. Why is it defaulted to 25 still? Do I need to add 587 somewhere else or something?
    Ahh, the joys of ports.
    There are two methods of implementing SSL with SMTP. One is SMTPS (which runs on port 465), the other is via TLS which uses the standard SMTP port. The difference is that SMTPS encrypts the entire connection (similar to HTTPS vs. HTTP), whereas TLS starts off with a non-encrypted connection and switches to secure once both client and server agree to use it (the client identifies itself, the server states it can use TLS, the client initiates a TLS session).
    TLS is the model supported by Postfix, and that's why you still use port 25
    Port 587 is the submission port. The line between 25 and 587 is pretty blurry, but many people implement different access controls and/or process rules for port 587 and have local users use that, leaving port 25 for non-local mail. Both ports can support TLS but you need to get under the hood to configure it.

  • POP before SMTP on SENDmail

    Hi ,
    I am trying to send out mails using sendmail, but the server requires SMTP authentication.
    Does any one know , as to how this can be done.

    So, I've set SSL as "required", and also set CRAM-MD5, and basically I can see now that I can't receive any emails.
    This really is one of the areas in which the Server Admin GUI lets you down.
    If you set SSL as required, many remote servers won't be able to talk to you because they don't talk SSL by default. To enforce SSL for your users you really need a second port that forces SSL in addition to the standard port that doesn't.
    You can do that, but only by delving in to Postfix's configuration files.
    However, I've gotten something strange - I thought SMTP over SSL should default to 587. Why is it defaulted to 25 still? Do I need to add 587 somewhere else or something?
    Ahh, the joys of ports.
    There are two methods of implementing SSL with SMTP. One is SMTPS (which runs on port 465), the other is via TLS which uses the standard SMTP port. The difference is that SMTPS encrypts the entire connection (similar to HTTPS vs. HTTP), whereas TLS starts off with a non-encrypted connection and switches to secure once both client and server agree to use it (the client identifies itself, the server states it can use TLS, the client initiates a TLS session).
    TLS is the model supported by Postfix, and that's why you still use port 25
    Port 587 is the submission port. The line between 25 and 587 is pretty blurry, but many people implement different access controls and/or process rules for port 587 and have local users use that, leaving port 25 for non-local mail. Both ports can support TLS but you need to get under the hood to configure it.

  • Setting mail with Cox (or other services with different servers for pop and smtp)

    My Cox mail account uses different servers for pop and smtp (my personal ISP 1&1 does too).
    The mail applet on my Blackberry Curve 8330 with Verizon does not allow to define different servers for pop and smtp, and further, for SSL smtp mail, the port is fixed at 995 and cannot be changed, while Cox (and 1&1) want to use 587 or something like that.
    As a result, I can only receive mail with these services.
    I also have yahoo mail, which works fine, so I can send mail with it and it is not a life-and-death situation, but I would like to be able to just reply to email sent to my Cox address.
    I called Verizon and they said BlackBerry provides the mail access through their servers and the applet, so there is nothing they can do.
    Is there a way to set it such that I can not only receive but also send mail through either of these services?
    Thanks in advance,
    Didier
    PS: Other than that, the Curve on Verizon rocks!!! so much better down here than AT&T it's not even funny.

    OK, thank you for the input.
    The problem I have with this solution is like the one I have now using yahoo.
    There are 2 problems:
    1) mailing lists want the mail to come from the account that is subscribed, so if the cox account is subscribed, I can't contribute from the blackberry, and if the blackberry account is subscribed, I don't get my mail in Outlook. Neither is good for me.
    2) people who send me mail to the Cox account and get replies from me from the blackberry continue responding to the account that can send from the blackberry (not Cox), and from that point on I do not have that mail on the computer.
    The issue of having two copies is no big deal, I just delete the mail I do not need. I would rather have two than none.
    Really, Blackberry should modify the email service so that they directly support mail systems like those of Cox and 1&1. I am sure there are others. They should also allow the use of another port for SSL than 995. I have not seen anyone using 995 for SSL.
    Until recently, I had a BB provided by my employer, and we had a BES, and that worked really well. I would like to emulate as much of that functionality as possible without having to pay somebody another $10 or $20 a month just for the priviledge of having an account on a private BES server.
    Anyway, thanks for the exchange and suggestions.
    Didier

  • IMAP, POP and SMTP information for manual email setup

    How to manually set up your Telstra email service:
    Telstra email on the BigPond platform
    POP & SMTP
    Your name
    Enter your name as you’d like it appear in emails you send.
    Account type
    POP3
    Incoming server details
    Server address
    mail.bigpond.com
    Port
    995
    Encrypted connection
    SSL
    Outgoing server details
    Server address
    mail.bigpond.com
    Port
    587 or 465
    Authentication
    Yes
    Encrypted connection
    With SSL Encryption
    Username
    Enter your full email address (ending in '@bigpond.com' or '@bigpond.net.au')
    Password
    Enter your Telstra email account password which will be case-sensitive.
    Other settings to check
    Ensure the checkbox is ticked for Outgoing server requires authentication – in most mail clients, this is not ticked by default.
    Use:
    Secure Sockets Layer (SSL) with the POP and SMTP connection, and
    SMTP authentication for security.
    Ensure that your operating system and email client have the latest updates.
    Telstra email on the Outlook.com platform
    If you’re on the Telstra email platform with Outlook.com®, you can choose either of the following types of settings to set up email on your computer, tablet or mobile phone:
    IMAP and SMTP
    POP and SMTP
    Where possible, it’s preferable to use the IMAP & SMPT settings as they provide an extra layer of security.
    IMAP and SMTP
    Your name
    Enter your name as you’d like it appear in emails you send.
    Account type
    IMAP
    Incoming server details
    Server address
    imap-mail.outlook.com
    Port
    993
    Encrypted connection
    SSL
    Outgoing server details
    Server address
    smtp-mail.outlook.com
    Port
    587
    Authentication
    Yes
    Encrypted connection
    With TLS/STARTTLS (preferred) or SSL Encryption
    Username
    Enter your full email address (ending in ‘@bigpond.com’ or ‘@bigpond.net.au’)
    Password
    Enter your Telstra email account password which will be case-sensitive.
    Other settings to check
    Ensure the checkbox is ticked for Outgoing server requires authentication – in most mail clients, this is not ticked by default.
    Use:
    Secure Sockets Layer (SSL) with the POP and SMTP connection, and
    SMTP authentication for security.
    Ensure that your operating system and email client have the latest updates.
    POP and SMTP
    Your name
    Enter your name as you’d like it appear in emails you send
    Account type
    POP3
    Incoming server details
    Server address
    pop-mail.outlook.com
    Port
    995
    Encrypted connection
    SSL
    Outgoing server details
    Server address
    smtp-mail.outlook.com
    Port
    587
    Authentication
    Yes
    Encrypted connection
    With TLS/STARTTLS (preferred) or SSL Encryption
    Username
    Enter your full email address (ending in '@bigpond.com' or '@bigpond.net.au')
    Password
    Enter your Telstra email account password which will be case-sensitive.
    Other settings to check
    Ensure the checkbox is ticked for Outgoing server requires authentication – in most mail clients, this is not ticked by default.
    Use:
    Secure Sockets Layer (SSL) with the POP and SMTP connection, and
    SMTP authentication for security.
    Ensure that your operating system and email client have the latest updates.
    Outlook is a registered trademark of Microsoft Corporation in the United States and/or other countries.

    Re: BigPond settings for POP, IMAP and SMTP
    I am have trouble with Apple: they claim that because I have not physically changed my email address they won't "accept" it! (it's same one that I have had for the past 5years),
    I am also unable to log on using the email address & password that I have for past 12 months!
    Can I change my email address and password, when I have time (during business hours), regards Eric

  • (OT) Hotmail por POP o SMTP?

    Hola foreros
    Descargarlo por configuración de HTTP es fácil para
    los que somos pioneros y
    no hemos dejado más de 30 días sin visitar nuestro
    correo.
    Pero ...................... Como se hace por POP o SMTP?
    Lo necesito con el fin de configurar Gmail, me importe los
    email de cuentas
    de Hotmail
    Gracias y espero respuesta

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    Principal
    http://martinvives.blogspot.com/2007/03/transfiriendo-todo-el-correo-de-h=
    otmail.html
    Gracias Daniel Naranjo
    Saludos desde Colombia
    "Daniel Naranjo" <[email protected]> escribi=F3
    en el mensaje =
    news:[email protected]...
    Daniel, creo que Hotmail ya no esta dando soporte POP ni
    STMP... de =
    igual forma, verifica esa informaci=F3n en la web de Hotmail.
    Saludos
    Daniel Naranjo
    Lo Ultimo Group, C.A.=20
    (+58) 414 7962406 / 416 2917532 / 295 6117632=20
    www.loultimoenlaWEB.com
    www.loultimoenHosting.com
    www.loultimoenViajes.com
    "Anuack Technology de Colombia"
    <[email protected]> escribi=F3 =
    en el mensaje news:[email protected]...
    Hola foreros
    Descargarlo por configuraci=F3n de HTTP es f=E1cil para los
    que =
    somos pioneros y=20
    no hemos dejado m=E1s de 30 d=EDas sin visitar nuestro
    correo.
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    size=3D2></FONT> </DIV>
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    size=3D2></FONT> </DIV>
    <DIV><FONT face=3DArial size=3D2>Gracias Daniel
    Naranjo</FONT></DIV>
    <DIV><FONT face=3DArial
    size=3D2></FONT> </DIV>
    <DIV><FONT face=3DArial><FONT
    size=3D2>Saludos desde=20
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    <DIV>
    <P></P>
    <P><FONT face=3D"Arial, Helvetica, sans-serif"
    size=3D2><STRONG>Daniel =
    Naranjo</STRONG><BR>Lo Ultimo Group, C.A.
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  • Free POP of SMTP mail server

    I am student, doing a project about javamail.
    I only have mail hotmail and yahoo mail account which are not working with my program.
    Actually i was trying to find a way to send and retrieve mail from them, since i'm going to pass my project soon, i just wanna find some other account which support the POP and SMTP, so i can do my testing!
    Could someone tell me some free POP of SMTP mail server, which i can do my testing!!
    Thanks

    I am student, doing a project about javamail.
    I only have mail hotmail and yahoo mail account which
    are not working with my program.
    Actually i was trying to find a way to send and
    retrieve mail from them, since i'm going to pass my
    project soon, i just wanna find some other account
    which support the POP and SMTP, so i can do my
    testing!
    how to create a mail server
    Could someone tell me some free POP of SMTP mail
    server, which i can do my testing!!
    ThanksI am student, doing a project about javamail.
    I only have mail hotmail and yahoo mail account which are not working with my program.
    Actually i was trying to find a way to send and retrieve mail from them, since i'm going to pass my project soon, i just wanna find some other account which support the POP and SMTP, so i can do my testing!

  • I need to find my POP and SMTP addresses

    When I try to send e-mail to some businesses their system asks for a POP and SMTP designations. How can I find those numbers? I am pretty sure the first one is POP3 but I would like to verify it. I cannot send the message without those designations.

    You don't need a back up to unlock your iPhone. If you want to find the back up then the article below will show you where to find it if you did make one:
    http://support.apple.com/kb/HT4946

  • RBL checking before SMTP auth for remote POP/SMTP users

    Just curious, does anyone know if this is still the case where the GWIA will reject a SMTP connection based on the RBL's before a user is able to authenticate?
    Yet if we point the SMTP to GMAIL it works OK, so Google obviously don't Black List consumer broadband subnets.
    The reason I wonder is that I have a situation again where a user working from home (on a consumer broadband plan) is being rejected from sending SMTP email via their office GWIA.
    To get around this in the past, I have configured a second GWIA on a say port 26 that only accepts authenticated SSL connections, and instructed remote staff to send via this GWIA.
    - Gordon

    On 01.07.2013 16:46, gordon mzano wrote:
    >
    > JUST CURIOUS, DOES ANYONE KNOW IF THIS IS STILL THE CASE WHERE THE GWIA
    > WILL REJECT A SMTP CONNECTION BASED ON THE RBL'S BEFORE A USER IS ABLE
    > TO AUTHENTICATE?
    Yes, that's still the case.
    > Yet if we point the SMTP to GMAIL it works OK, so Google obviously
    > don't Black List consumer broadband subnets.
    Of course they don't, it would invalidate their whole product, which is
    designed to be used from such subnets.
    > The reason I wonder is that I have a situation again where a user
    > working from home (on a consumer broadband plan) is being rejected from
    > sending SMTP email via their office GWIA.
    > To get around this in the past, I have configured a second GWIA on a
    > say port 26 that only accepts authenticated SSL connections, and
    > instructed remote staff to send via this GWIA.
    Another, much more functional option is of course to open up the POA
    ports to the outside and let your remote users use the groupwise client
    instead of pity POP/SMTP.
    CU,
    Massimo Rosen
    Novell Knowledge Partner
    No emails please!
    http://www.cfc-it.de

  • Mail server stops IMAP and POP services, SMTP won't work

    Hello fellow Lion Server users,
    I am trying hard to get my mail server productive. I want to fetch mails from my ISP's IMAP mail server and distribute it to all my devices via my own mail server. Also the mails shall be sent via ISPs SMTP.
    After managing it being able to send and receive email in the way I want I realized that web server was down. Because I want to use the integrated web mail and Wiki server I had to fix that. After restoring to default values in httpd.conf and others I got that problem solved just to realize that I am not able any more to send and receive email. I would be grateful if you could help me out.
    The current status is that Server admin app claims the mail server still running, but POP, IMAP stopped whilst SMTP is running. In my mail.app I can send Emails successfully but they never reach the addressee. Receiving is just not possible at all. The connection doctor in integrated in Mail.app won't find a problem. It claims SMTP and IMAP connections I used before are working.
    I use a dyndns forwarding to my server at home. Lion server is up to date. Port forwarding in the router is enabled (for each port Apple suggests).
    Even in local network (with this very machine) it is not possible to successfully send or receive emails using localhost. My guess is that something went wrong in the configuration files but I don't know where I have to look and for what exactly.
    I also tried a program called MailServe after running into the first problems with the mail server which did so far a good job in configuring of Postfix, Dovecot and Fetchmail but now I am stuck.
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    I think I may have just figured out a part of this puzzle. I have more than just my att account set up in Mail. Even though all of my accounts are setup to use the ATT SMTP server only (with the appropriate ATT login info) I am getting the same rejection notices as everyone else.
    I noticed that in the rejection notice though, that it was saying I was sending mail from my other main account, not my sbcglobal (ATT) account. I thought that was strange since I set up all my accounts to use the SBC (ATT) login info for ATT's SMTP Server. So obviously it is a problem in Mail. Mail is somehow confused and sending some wrong piece of info to the SMTP server. When I changed the sender from my other account to my SBCGLOBAL account, the mail went right out with no other problems.
    So this isn't a solution for those of you who are struggling with only an ATT account, but I think it points to a possible problem within Mail. The answer might be to delete the accounts in Mail and set them back up again. It's looking like Apple might need to make a tweak to Mail to fix this if indeed this is the correct cause. Hope this helps someone.

  • How to set up two POP e-mail accounts using the same POP and SMTP servers

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