WIP: Late encryption - #8619
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It was incorrectly converting unused row ID to MsgId type and selecting already known msg_id.
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For unencrypted messages we only want to send a copy to the sending address, but we don't know the sending address when queueing the message. Adding bcc-self recipients when dequeuing the message also makes it possible to send copies to updated list of relays.
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Part of #8607, this removes the code that deletes the whole queue when the sending relay is changed, and makes queueing the mail independent of the sending address. Sending address is decided later in SMTP loop (and in various testing utils that emulate sending).
Follow-up to #8345 in some way, this now uses
QueuedMailfor real.Based on #8585
Not yet ready for review as i want to cleanup some things (TODOs/FIXMEs), group SQL into a transaction.
As for performance of encryption: maybe it even makes UI more responsive because the message bubble can appear on the sending side faster as the message does not need to be encrypted yet.
There is likely some overlap with key updates as it may need another column to disable intended recipient fingerprints if key updates are asymmetrically encrypted and signed, i'll rebase this change later if needed or worst case there is another migration to add column to
smtp2. Or maybe key updates are generated on the fly and do not go into SMTP queue similarly to MDNs, and then there is no problem with the table structure.