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Had this issue myself multiple times as well, but failed to reproduce for a while using newer Go releases. The reason seemed to be a lock race when saving the message to the IMAP storage backend while the mail is still being sent and resides in the outbound queue. My mail client shows an error saving the element. After retrying manually enough time has passed. Those operations don't play well together in parallel.
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RadimEZ commentedon Oct 4, 2025
Had this issue myself multiple times as well, but failed to reproduce for a while using newer Go releases. The reason seemed to be a lock race when saving the message to the IMAP storage backend while the mail is still being sent and resides in the outbound queue. My mail client shows an error saving the element. After retrying manually enough time has passed. Those operations don't play well together in parallel.
feat: Add new issues for bug reports and feature requests