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Run mail_restore (mchk) or just mail_outgoing_restore (which is its part).

Well, you should have. Sieve is not supported in Courier-IMAP (that's also basically a reason why you got the error message in previous Plesk version), so if you would like to use server-side mail filtering, then you have to switch to Dovecot via Parallels Installer.

Dumb question: you did switch from Courier-IMAP to Dovecot, didn't you?

You're doing it wrong. The issue the topic starter is facing likely means that webmails upgrade was not finished properly. If you don't have webmail config customizations, then probably reinstalling them via Parallels Installer would be the quickest and best solution (first remove, check that no...

Sounds like you've deinstalled Plesk and then installed it back. FYI: there should be dumps of Plesk DB in /var/lib/psa/dumps, if memory serves me right. Restoring one of them might help you.

"Hour" is rolling, so it's possible to send mails provided total number of mails sent during one hour window ending at "now" is below the limit. Whether mails are lost or not depends on the mail client used to send them. Most clients will attempt to resend mail later or immediately notify user...

This message should appear neither when using Outlook, nor Horde (since they use SMTP). This means that either you're looking at the wrong log line, or your mail subsystem configuration is slightly wrong.

Unless you have failed basic authentication attempts logged, Fail2Ban will do nothing (since it's authentication failure monitor). Alternatively, if you have a custom login solution, then you need to 1) make sure it logs authentication failures somewhere, 2) create a filter and jail in Fail2Ban...

From the changelog:

What is the user your fail2ban daemon runs under? What permissions do error_log files have? Do you have selinux or anything similar enabled?

Yes. And this is available only in Plesk 12.0.

Yes, most definitely so.

Looks like your installation was not upgraded completely. Normally during upgrade to 12.0 Roundcube and Horde are reconfigured to send mail via SMTP instead of sendmail. Check your upgrade logs for errors and warnings.

These are not PHP options, but rather Apache modules. You may enable and disable Apache modules from the Panel settings. You may install additional modules using your OS package manager (yum).

Try running bootstrapper repair.

You either need to install php53-mcrypt instead or first switch from php53 to php packages, then install php-mcrypt. Also consider migrating from CentOS 5 to a more recent OS in the future.

Try purge instead of remove.

Technically it's not. It doesn't describe how to do this for Dovecot.

Regarding mod_security - you still need to install it via Installer after upgrade to be able to use it. Layout on file system would probably differ from what you've been using since everybody configures mod_security the way they want and there's no consensus. Regarding sendmail binary - I...

Restore Plesk DB backup. It is located somewhere at /var/lib/psa/dump (IIRC) and was made before upgrade. Look up exact file name in upgrade logs. Then try to upgrade again. If Parallels Installer wouldn't let you upgrade run bootstrapper repair instead.