Cannot send emails from Mail App

I cannot seem to send any mail from my desktop mail app for some reason (it USED to work!!).
This is the error command it gives me:
"This message could not be delivered and will remain in your Outbox until it can be delivered.
The server "smtp.mac.com" refused to allow a connection on port 25."
I've had a look at some of the settings and a fiddle round with them but I still suffer from the same thing. It has resulted in me having to log into .Mac everytime I want to reply to mail I recieve in my mailbox!
Anyone have any ideas?
Cheers.

I just received the update last night. Now today I am also unable to send. I called support, Apple said it was my ISP, they said it was Apple. I still can't send. I think it is Apple, but limited support has not helped.
I cannot seem to send any mail from my desktop mail
app for some reason (it USED to work!!).
This is the error command it gives me:
"This message could not be delivered and will remain
in your Outbox until it can be delivered.
The server "smtp.mac.com" refused to allow a
connection on port 25."
I've had a look at some of the settings and a fiddle
round with them but I still suffer from the same
thing. It has resulted in me having to log into .Mac
everytime I want to reply to mail I recieve in my
mailbox!
Anyone have any ideas?
Cheers.

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Cannot send email in mail app. using POP account with Wi-Fi

I recently moved to an apartment that only has wireless internet access. Since moving I cannot send email using my POP account, although I can receive email. I was also not able to receive email using my .mac account, but I learned through this forum to change server port to 587 in .mac account and now I can send via .mac account in mail app. But I still cannot sent email with mail app. using my POP account. I changed no settings when I moved, and have never had this problem with cable. Any suggestions?

It all depends on the policy of whoever is the ISP at your new location and the method used by the outgoing (SMTP) server to determine whether you’re a legitimate user.
In an attempt to fight spam, many ISPs restrict the ability to send using an outgoing (SMTP) server not owned by them, usually by blocking port 25 for all traffic outside their own network, which means you cannot send with an SMTP server not owned by them if configured to use that port number. And it may happen the other way around as well, i.e. the outgoing server itself may look at the IP address you’re connecting from and refuse the connection if you’re outside its own network.
Something that often works is changing the outgoing server port to 587 (or whatever alternate port number the outgoing server listens to) instead of 25 and using some form of authentication in Preferences > Accounts > Account Information > Outgoing Mail Server > Server Settings, but two conditions must be satisfied for this change to work: (1) the ISP must not block that port as well AND (2) the outgoing server in question must listen to that port and accept a form of authentication not based on the IP address you’re connecting from.
Independent mail service providers not tied to a particular ISP, such as .Mac and Gmail, do allow authenticated SMTP access on port 587, which is the reason changing the outgoing server port number solves the problem for them if the ISP doesn’t block that port as well.
The following article, for example, describes several ways to address this issue in the case of .Mac, but can be useful for other mail accounts as well (not just .Mac), and applies to all versions of Mac OS X (not just Mac OS X 10.4.2 and earlier as the article states):
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I have recently opened a .mac account and started using the email service. It works fine online however I am having difficulty sending messages through the Mail application in Tiger.
Whenever I attempt to send a message, a dialog box appears saying "Cannot send message using the server smtp.mac.com".
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Hello David.
Who is your ISP used for connecting to the internet and are you accessing an email account snd SMTP server in Mail provided by your ISP?
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Cannot send emails from mail account.

Hello everyone,
I've had this problem a while, that basically when i send an email from my account it says
Cannot send message using the server xxxxxxxx
when i try other servers it still doesn't work and i get the same error message. I have other computers on which mail works from the same server, same port same password etc. so why doesn't this work.
If you can help me i will be eternally greatful as i won't have to keep jumping on someone elses computer to reply to mail.
Thank you in advance
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Hello Fred.
If you’re sure your settings are exactly the same as on the computers where it works, here a couple of things that you may want to look at.
Go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list.
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Mail keeps information about outgoing servers in a separate list, independently of any specific mail account. The account settings just associate one of the available outgoing servers with each account. Orphaned or dangling outgoing server entries (i.e. not associated with any account) sometimes cause weird sending problems.
Go to Mail > Preferences > Accounts > Account Information > Outgoing Mail Server (SMTP), choose Edit Server List from the popup menu, and delete any servers that shouldn’t be there. The Edit Server List panel shows the account each outgoing server is associated with.

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Hello Fred.
If you’re sure your settings are exactly the same as on the computers where it works, here a couple of things that you may want to look at.
Go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list.
Also, try using a different method to connect to Internet, if possible, or connecting the computer to Internet as directly as possible, i.e. bypassing any routers that might be present, using an ethernet cable instead of wireless, etc., and see whether that makes a difference.
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Hi
I had a power failure 2 days ago, my computer is running again, but now I cannot send email from my iPad using Cox or my gmail account. I am receiving mail in my Cox account but not my gmail account.It was working fine until the power failure. It keeps telling me, the user name or password for Gmail is incorrect. I have not changed anything. I don't know what is wrong. Can anyone help me? Thanks

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Cannot Send emails from Mac Mail

I cannot send emails from my Mac Mail.
Originally got a error message to check with the ISP about port 25 being
timed out. I deleted the email account and recreated it a new.I did all the
checking and rechecking of the account settings and passwords etc.......
I then got this message
Error message: Server response was 5.1.0 authentication required
Comcast did not know the error message 5.1.0
Help!
Thanks,
Roberta

Hello Robertaa,
You may want to have a look at this topic with support offered by the user "David G" that might apply to your situation.
hope that helps some,
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For IOS7.02
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Cannot send emails from Mail App

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