[CentOS] Error in Squirrelmail

Tue May 22 14:33:39 UTC 2012
Edson - PMSS <edson.amaral at saosebastiao.sp.gov.br>

Yesterday I upgrade my CentOS e-mail server and I changed the version of 
Squirrelmail and PHP. Now, after the changes, I can't send e-mail by 
squirrelmail. I can send only by e-mail clients like Thunderbird and 
Outlook in the network.

I did a backup of the old configuration and data files and I replaced it 
on the new configuration, but nothing happen. I need someone's help. 
Thank you.