Common errors

• quota full, disk space full (metacache, fscache)
• NFS/network error
• service process_limit reached, client_limit reached
• “my email is broken” -> how to track everything via session-id from “proxy/director/backend” and find user’s error logs etc. disconnection reasons, etc.
• “my email was lost” (pop3, mail_log plugin, imap logout message)
• SMTP/LMTP/Sieve interaction/problems
• ^^^ show example log lines for everything