Mail app not sending emails on iMac M1 after startup

I have a IMac 24" M1 2021 which has a problem every morning at startup and the first few emails I compose has the Send button greyed out and the only way to resolve it is to restart the machine, sometimes this requires three or four attempts. I have just updated to Sequoia 15.5 but the problem still persists. Any help in solving this would be greatly appreciated.



[Re-Titled by Moderator]

iMac 24″, macOS 15.5

Posted on May 15, 2025 1:48 AM

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Posted on Jun 5, 2025 9:29 AM

This is now a known bug, which was meant to be cured in 15.5 but persists and is 'under investigation' by Apple. Turning off both spell check and 'Undo send delay' options, quitting and relaunching Mail, may help while we await a system update that solves the problem.

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Mail app not sending emails on iMac M1 after startup

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