Mac mail will receive but not send, happened yesterday!

Hi, my mac will receive email but not send anything. I didn't do anything differently and it was working just fine before. Can someone please help me. I am trying to get work emails out and they won't send. Gmail and exchange won't send, it's not just one email provider. Please advise. I have looked up other forums and I don't think it has anything to do with the settings because it worked before.
Thanks for your help.

Hi, krissycoleh.
Here is the best resource to go through when troubleshooting issues with email.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/TS3276
Cheers,
Jason H.

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Hi, my imail is receiving but not sending. I have 3 other computers in the office with different email address using imail and they are working fine? I deleted the account then added it and still cant send mail. its not a server issue because all other email address for our office email work just not mine.
any help will do.

Try 'synchronize' under mailbox menu. Have had the same problem sporadically for no apparent reason. Have 3 email accounts set up and sometimes just one of them does this- different one every time. I call the ISP and it is not a problem on their end- and I know that is true because I can logon to the web-based version and see the emails that I am not getting in Apple Mail. Synchronize sometimes has fixed this problem for me.

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Hi All
I have just got one of the new MBPs. I have synced it using .Mac with the Mail preferences that are on my iMac G5. I can receive mail fine but it won't send any and just times out complaining about the mail server suggesting I try another one.
My G5 is off at the moment as I m away on holiday and bought the MBP while I am away.
All the setting seem OK in Mail / Preferences and I am stumped.
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You get the same error message with the POP account as well? I assume the outgoing server that Mail complains about now isn’t smtp.mac.com, is it?
Are this POP account and the associated outgoing (SMTP) server provided by the ISP at your current location or by someone else? Note that when you’re not at home, the ISP at that location is usually not the same as the ISP when you’re at home.
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.
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Hi ...
Mac Pro, Mac OS X (10.7.2), Lion.
From the Lion Help viewer ...
If you can’t send messages
If the Send button is dimmed or you see an alert that your message can’t be sent using the outgoing mail server, you might not be able to send messages. Here are some things you can try:
Make sure the outgoing mail server is specified correctly, as directed by your email service provider.Verify your outgoing mail server
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Thanks Spaidr,
That was part of it. I did an end-around by setting up an alternate outgoing (send) server which was the same as the primary, identical settings, name, password. I deselected the primary and used only the secondary. Reboot as you suggested and Voila! Something must have been corrupted in the primary.
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http://support.apple.com/kb/TS3899
Can’t Send Emails on iPad – Troubleshooting Steps
http://ipadhelp.com/ipad-help/ipad-cant-send-emails-troubleshooting-steps/
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http://www.apple.com/support/ipad/assistant/mail/
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http://www.apple.com/support/ipad/mail/
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Mac mail will receive but not send, happened yesterday!

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