Hot answers tagged dovecot
My guess is that it's your submission service there which is a wide open one. I think it currently lets anyone to connect there and just send the e-mail without actually requiring authentication. Alternatively your SASL config is messed up in a way that it returns "OK, this user can authenticate" even when it should not. (Been there, done that)
Dovecot is an IMAP server. Address books are not part of what IMAP does.
Address book is not a part of IMAP server and provided by 3rd-party services like LDAP. So you have to dig in some other direction.
Sounds like you've suffered some sort of soft disk failure that has triggered a check/rebuild of the disks and that failure corrupted part of the dovecot installation. I would also: If possible, check the S.M.A.R.T. performance/health counters for your disks, there might be a catastrophic hardware failure imminent Verify the files of other packages using ...
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