Mail will not send email on MacBook Air Sequoia 15.4.1
I can receive mail but cannot send mail on my MacBook Air after a recent OS update. The update introduced changes to Mail, including the new "Categories" view. My MacBook Pro and two iPhones can send mail but not the Air. I have done all the fixes with server settings, rebooting, etc, including AOL's "Fix problems sending AOL Mail" suggestions (https://help.aol.com/articles/aol-mail-troubleshooting) This suggests the problem is with Apple Mail, not AOL. Only once I got the error message cannot send with selected server. I selected the correct outgoing server but it would not send. I accidentally discovered that if I place the curser at the end of the message content (after my signature for instance) and hit return, the message will send. I prefer not to use the accidental fix but will have to until I get this resolved. Also, another incidental: If there are mispelled words in the content, sometimes Mail will prompt for corrections and then send the mail, but not always. I prefer not to delete the online account and reinstall it because it takes hours to rebuild my mailboxes. Am I missing something here? Any suggestions for fixing this annoyance will be much appreciated. Thank you in advance for your attention.
MacBook Air (M2, 2022)