Can no longer send or receive email from any account after Security Update

Hello,
I have a problem with my email in Mail. I let software update install the latest security update (007) a few days ago. I have not been able to send or receive my email since the update. I have several accounts and use Mail as my client for all. This includes my mac.com account, 3 att.net accounts and my website email. All give me the same error which is an SSL thing and has something to do with the certificates. I am able to receive email if I turn SSL off on the ATT accounts but not the mac.com (and if I try to collect my email with SSL off I get an angry message from ATT warning me I am not allowed to do so) and I cannot send any at all from any account.
The error message reads "unable to connect- there may be a problem with the mail server or network.... The server error encountered was: Mail was unable to verify the identity of this server, which has a certificated issued to "mail.mac.com". The error was: An SSL error occured while trying to read data from the server. Verify this server supports SSL and that your account settings are correct". It then states that the certificate could not be verified.
The certificate date on the mac.com account reads May, 29th , 2010.
I also have an iMac and a MacBook Pro which are also running Tiger. I have not and will not run the security update on these machines until I find out why it has messed up my email on the G5. I can still send and receive email with the exact same account settings on the MacBook so I know it is not the settings but something to do with the Security Update.
Has anyone else had trouble with this update? Any advice?

Hello and Welcome to Apple Discussions ...
I don't know if this is a corrupted preference file or not, but it sure can't hurt to try this.
If Mail is open, Quit Mail.
/Users/YourName/Library/Preferences/com.apple.mail.plist
Drag that .plist file to the Desktop. Launch Mail and see if you can send or receive e-mail. If you can, that .plist file is corrupted. Drag it to the trash, empty the trash and reboot. Your Mac will create a new preference file for you the next time you launch Mail.
Also... run Disk Utility and Repair Disk Permissions. Disk Utility is in your Applications/Utilities folder. Launch DU, select MacintoshHD 10.x.x in the panel on the left, select the FirstAid tab, click Repair Disk Permissions. Quit DU when it's finished and reboot.
Carolyn

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