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Mail without a subject or sender

Hello
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I have a mail server (postfix + dovecot + amavis + clamav + mysql + dkim) on Centos 6.8. Last I updated the PHP version 5.6.26. Since that time I have problems with the mail. Users see in squirrelmail e-mails are missing sender or subject, or both things at once. This is not always the case but there are times. The result is their inability to read.
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I looked maillog but nothing alarming was not found. Everything looks normal. I can not deal with it. Postfix and dovecot still operate normally. Mail is sent and received. I bet on amavis + clamav but my experience is too small to insist. What do you think? We care about the time, so please any advice or clue or anything that could steer me to solve this problem.
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Regards
mariusz

Quote:

Last I updated the PHP version 5.6.26. Since that time I have problems with the mail. Users see in squirrelmail e-mails are missing sender or subject, or both things at once. This is not always the case but there are times. The result is their inability to read.

My guess is that is a squirrelmail/php problem, as squirrelmail is quite dated and perhaps is not compatible with the latest php.

You should check the webserver logs to verify if that's the case. You may also enable/config php logging and see what you get.

Regards

You're right. Squirrelmail does not work properly with versions of PHP 5.4 and above, I installed 5.6. I changed to roundcube and everything is ok

Regards