Can't send Mail after Mac OS 10.4.3 Update

Darn, I wish I hadn't run the latest update on a number of Mac G4s. I had no issues whatsoever with Mac Mail 2.0 using IMAP on our Exchange server until the latest update. Currently users are having sporadic issues with mail getting stuck in the outbox. I have spent the day reading the forum and trying various things (trashing the outbox, deleting preferences, using OnyX, etc). I can send fine from OWA and even from Entourage but not Mail mail. The Connection Manager shows I'm connected fine to both IMAP and SMTP but the Activity Viewer basically just stalls. I get no error messages. I have a hard time believing it's anything other than the Mail client or some software it utilizes, having been corrupted from the upgrade. Does anyone have any suggestions

Doh! I finally ended up discovering exactly what my issue was with not being able to send attachments in any E-Mail (Mac Mail, Entourage, etc.) on a Mac. The 10/100/1000 NIC on the MS Exchange Server was manually set to 100MB and plugged into a gig port on the switch. Just thought I'd throw it out there in case anyone else has the same issue.

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from smtpout09-04.prod.mesa1.secureserver.net [64.202.165.17]
----- The following addresses had permanent fatal errors -----
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... while talking to smtp-bounce.mac.com.:
DATA
<<< 550 5.1.1 unknown or illegal alias: [email protected]
550 5.1.1 <[email protected]>... User unknown
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Last-Attempt-Date: Thu, 6 Sep 2007 09:46:35 -0700 (PDT)

This is only a guess, as there is no host "smtp-bounce.mac.com": your mailserver smtpout09-04.prod.mesa1.secureserver.net is currently listed at least at one blacklist service (take a look here http://tqmcube.com/cgi-bin/rbltqm?ip=64.202.165.17 to verify) as a spammer.
I am not sure about the technology Apple uses to prevent SPAM, but it technically would be possible to check for listed servers before establishing a connection and saying "HELO" with a faked hostname (smtp-bounce.mac.com in that case) and bouncing all mail.
The second possibility is, of course, that the given error "User unknown" is correct, and the user imply does not exist.
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Aggg. Help.
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thanks!

Hello,
If you open the Activity viewer (click on Window in the menubar and choose Activity) and watch when you try to send, what phases if any are indicated are taking place before failure?
What type of authentication is required for this SMTP? When using in Entourage, what are the selections in Advanced sending options, particularly regarding the box beside Use same settings as receiving mail server?
Ernie

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I suddenly (without makng any changes to my computer or settings) can't send emails from any of my accounts on mac mail. I have looked through various discussions and can't find anything helfpful. Can anyone help?? I am using OS X Lion 10.7.5. Please help!!

Hey HVH67,
Welcome to Apple Support Communities! While you may not have found your exact situation, the general troubleshooting steps for email might help resolve the issue. Take a look at the following article, go through the steps, and see if that helps:
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Sincerely,
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