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Stalwart advertises `maxDelayedSend` as a fixed 30 days, but its MTA rejects any hold beyond `futureRelease`, 7 days by default. Scheduling a message 8 to 30 days ahead passed the picker and then failed with "501 5.5.4 Requested hold time exceeds maximum of 604800 seconds". On Stalwart the advertised 30 days now counts as 7. When a submission is still rejected for its hold time, the limit from the error message replaces it for the session, and the composer shows the translated "later than the server allows" message instead of the raw SMTP reply.