Petre Bandac writes:
and something likeimapd: Error: Input/output error imapd: Check for proper operation and configuration imapd: of the File Access Monitor daemon (famd). but this warning message (is it a warning message indeed) appeared earlier, when imap was working fine
No, it is an error message, but the server may be able to recover from the error condition most of the time.
But, as you've discovered, not all of the time.
pgpVtXaVc7Rr0.pgp
Description: PGP signature
