Managing Cyrus IMAP server - Cyrus system administration
Cyrus IMAP is a well-known POP3 and IMAP server that can also act as an MDA, or Mail Delivery Agent. These commands manage its configuration and troubleshoot problems.
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Cyrus-imapd.
2 articles on this topic
The "Mailbox is locked by POP server" problem
Cyrus-imapd commonly reports "Mailbox is locked by POP server" when more than one POP3 connection attempts to retrieve mail for the same user simultaneously.