Mail on cpanel server stopped working
I have several clients on the same server with reseller accounts who are suddenly complaining about the mail no longer working-They can NOT download mail to outlook express
They can NOT send mail through outlook express
They can NOT receive mail through webmail
They CAN send mail through webmail
I had them manually reconfigure outlook. No help.
I tried to look in the server email logs to troubleshoot:
/var/log/exim_mainlog
and got this error: permission denied

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Have tried these various fixes:
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/scripts/mailperm
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/scripts/updatenow
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/scripts/upcp
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/scripts/fullhordereset
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/scripts/fixwebmail
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/scripts/resethorde
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1. Repair the horde database through WHM
2. Delete any horde files in /tmp and restart cPanel
3. Force a cPanel update:
/scripts/upcp --force
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/scripts/fixeverything
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Nothing has worked, and I'm out of ideas.
Server specs:
WHM 10.6.0 cPanel 10.8.0-R27
CentOS 3.5 i686 - WHM
Any ideas? What else can I try?