Change submission port to 587 due to OP25B

One of the ISPs I use in Japan has implemented OP25B (Outbound Port 25 Blocking). It is a measure to curb SPAM related problems by forcing ALL SMTP traffic to go through the ISP's SMTP server. The ISP may secure this traffic by implementing SMTP AUTH, volume curtailing, and some virus filtering to minimize the damage of SPAM.
The issue here is, I cannot connect to any other SMTP servers outside of ISPs network, including those owned by myself. I have users on the road that need to send highly sensitive e-mails to colleagues back home, and I do not want to pass those messages through a third-party SMTP server that I KNOW is filtering and looking at the content.
So, I'm hoping there is a way to make a Mac OS X Server 10.4 mail server listen to port 587. I'm also hoping that the Leopard Server incorporates this into the GUI.

So I find this thing called Mail Connection Doctor hidden in the Window menu. It tells me:
Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences. also verify that the server accepts connections on port 587. If it does no, change the port number in the Advanced tab of Account preferences.
Well, I know that port 587 works from the outside of the LAN and also I can Telnet into port 587 from within the LAN. It just does not like listening to SMTP signals. I even tried with Firewall off, so I know it's not being blocked on purpose.
The only thing I can think of is a loopback problem. But then why does the server accept loopback SMTP requests on port 25? There must be something different between these two ports and how they accept incoming connections.

Similar Messages

  • Change SMTP port to 587 doesn't work

    Hi,
    my ISP blocks port 25, ok and no problem - not for the iphone.
    When i change port 25 to 587 it checks the config - works.
    After i gone back in the menu the account list, to save the settings, (still in the settings) and go again to the SMTP settings, port 587 has changed to port 25.
    Using iOS 4.
    Some ideas?
    I think the "smash the iphone" method should be the best - self created SSL certs make some problems to the mail.app and so on - very bad. Works under OS X but not on iOS. Never mind, it's ok if i could save atm the port 587.
    Cheers

    Still the same...
    Port 465 changes also back to 25.
    My provider @ home needs port 25, ever other port won't work.
    Outside i have to use port 465 or 587, but these ports don't be saved - i could only send 1 mail (wich is currently pending to send) after change the settings.

  • Help!! Cant send email how change my outgoing smtp port to 587 stuck on 25

    Im on OSX 10.1.4. I go to Mail, Preferences, Account, Select my email account, Select Edit, Select Account Options.
    All I see is a box saying Connect to server port: and it says 143.
    When I try to send mail a message says smpt port timed our port 25. I called my internet provider and they told me to change my outgoing port to 587 but I cant find where to change the 25 to 587.
    If I go back to the above and change the 143 to 587 my incoming mail stops working.
    Am I looking in the wrong place or did I setup my email incorrectly? I selected mac account, pop, smtp.mac.com outgoing server, mail.mac.com for incoming server...did I do something wrong. I have a mac mail email address.
    Please someone help me!!
    Thanks.

    So there's no way to send with other ports? You HAVE to use port 25?
    Sure there is - talk to every mail administrator of every domain you might ever want to send mail to and have them reconfigure their mail servers to listen on some arbitrary port number that you define. Wait for them to do it (it shouldn't take them too long), and then you're done.
    Oh, no, hang on a minute... none of them are going to do that, are they?
    But that's what you're asking for - you're asking for them to accept mail on some non-standard port number just so you can get around Verizon's mail blocking.
    There is a reason why standard port numbers (defined by IANA) exists - just so that everyone's talking on the same page (or at least in the same chapter of the same book). You can't arbitrarily pick a port number and expect it to work unless both sides of the connection know to use it. You know port 25 works for SMTP because that's the standard. You can use any port number you like for your own mail because you can configure your own mail client to use a non-standard port, but you can't convince the rest of the world to follow suit (at least not without good reason).
    In this case your options are to relay your mail through Verizon's servers, upgrade to their business plan (which supports hosting your own mail server and doesn't break the user agreement), or setup another mail server somewhere else that you can relay your mail through.

  • How to change SMTP port in exchange send connector

    Exchange 2013 SP1
    I use Comcast as a smart host. It needs to work on port 587. How do I change the default port to 587?
    John Lenz

    Hi John,
    You need to use the cmdlet 
    Set-SendConnector with the -port switch
    Cheers,
    Exchange Blog:
    www.ntweekly.com
    MCSA, MCSE, MCITP:SA, MCITP:EA, MCITP:Enterprise Messaging Administrator 2010,MCTS:Virtualization

  • Changing email port

    I have gotten a couple notices from Verizon about changing my email port for new security purposes. I have gone to Accounts, and changed my outgoing mail server (STTP) to outgoing.verizon.net. I then have gone into the Server Settings and changed the port number from 25 to their requested 587. It doesn't allow me to send email. I know this is a verizon question, but is anyone else having to make this change, and is it necessary with OS 10.4.11?
    Thanks

    Hi Maurice,
    A number of ISP's having been changing their port forwarding numbers to control spam problems for them and their customers. My account is with AttYahoo and they recently changed their outgoing port number.
    I can't recall off hand but check to make sure there isn't a "lock" icon that you need to tick once you have entered all the new settings and confirmed them.
    The mail settings need to be "exact" to work, obviously, so go back and check any spelling typos, especially with your password. Double check what you have entered for your SMTP address against what Verizon requires it to be now.
    Your question is slightly confusing as you mention if this is necessary with 10.4.11. Your specs show you are using 10.3. Is this two different machines and versions of the OS that you are discussing?
    If all else fails, I would recommend calling Verizon tech support and just ask them if they will walk you through their required setup for the Mail preferences. Trust me, they are quite accustomed to users needing help with mail settings. It used to be that you couldn't get a tech support person that knew anything about Mac OS but now they have their Mail setup, for whatever OS version, in front of them and can just walk you through the settings and troubleshoot if it doesn't work after that.
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  • How to change default port in iws 4.1 installed in Solaris 5.9

    Hi All,
    I had installed iws 4.1 in solaris 5.9
    Now , I want to change my default https port from 443 to 445 .
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    Thanks for help in advance.
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    Ya , Manish you are right IWS 4.1 is really old.
    But My application has been developed in past that is using IWS4.1 .
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    Message was edited by:
    write2jamesbond

  • How to change the port no in weblogic 10.3 server.

    Hi,
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    Thanks Advance.

    Hi,
    Please refer to : http://weblogic-wonders.com/weblogic/2010/02/25/changing-adminserver-port-using-jmx/ (Using JMX)
    http://forums.oracle.com/forums/thread.jspa?threadID=1037611&tstart=0 (Using WLST)
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  • My ISP tells me I need to I need to change the port to send/receive e-mails, but I can't remember my Mail password to add an account. How can I proceed without the password?

    My ISP tells me I need to change the port to send/receive mail, as the current port is going to be disabled for security reasons. But I can't remember my Mail password to add an account. How can I add an account when I don't remember my password? It's been several years.

    your email password is with your ISP so they can help. but if it is saved in the email app you can just change the ports in the preferneces without a password.

  • My provider changed to pop3 port 995 incoming and port 465 outgoing. Now it no longer works. I went into the Thunderbird 28 beta and changed the ports

    I have Thunderbird 28 beta. After changing the ports, I no longer receive mail and this is the error message going out:
    Sending of message failed.
    The message could not be sent because the connection to SMTP server mail.3dcartstores.com timed out. Try again or contact your network administrator.
    Passwords have not been changed and I have to login on the web

    What are the exact instructions from your email provider?
    Please post your Troubleshooting Information.
    AppMenu button - Help - Troubleshooting Information

  • Can't change printer port on Windows 8.1 and Server 2012 R2

    1. Install "Lexmark X646e Class Driver" using a in-box print driver (i.e. one comes with the Windows installation base) .
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    What Port Monitor just so I can bubble this information to some others?
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    Hi Alan:
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  • How do I change a port in Mac OS X Mountain lion

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    There isn't a generic way to do what you want.  Not on Microsoft Windows.  Not on OS X.
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    The worst-bad-ugly approach is to dump out the executable code, reverse engineer it, and patch the preferred port right into the code; to change the code without using the original source code.  Or some tool-specific configuration file or preferences setting, as and if available.

  • How to change audio port output to input port on mac os x 10.9.2 to connect electric guitar on macbook pro for garageband

    How to change audio port from output to input port so that i can connect my electric guitar to play along with garageband. I couldn't the option to change it in my system preferences of sound as my mac os x is 10.9.2. So please help me!!!!!!!!!!!! I want to play electric guitar with my garageband so badly!!! :O
    Mac os x 10.9.2. ; Garageband 10.0.2

    There is no audio line input on your Mac, get a USB interface, get one that is specified for guitars.

  • How to change the port in the URL of a BSP Iview

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    Hi there
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  • I am trying to set up my outlook 2007 account on i pad and the process sticks on verifying.  It would appear to be a problem with outgoing server and I have changed the port number but with no success.

    I have just purchased an i pad 2 and am having trouble with the e-mail set up.  Set up with wi-fi, i-cloud etc has worked fine but the i pad is recognising my outlook 2007 account details but is not verifying it.  The trouble appears to be with the outgoing server and I have tried changing the port number, but to no avail!  Also reset the account settings for holding messages on the server...help!  As you can tell I'm not very techy and I'm desperate to get the bloody thing working as I'm going away on Tuesday! Any suggestions?

    I had a similar issue and it was password case sensitive issue

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