TL;DR: My user-mail-address is properly ["me@mydomain.com](mailto:"jason@mailjason.com)" when I'm in the compose buffer (context triggered). And then when I C-c C-c to send it comes from the wrong (default) email address... even though the name part stays correct. So somehow the email to send from is getting clobbered at send time.
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I've tried so many things with various results, I know people will want all my configs but I'm just wondering where else to look that can potentially cause a clobbering. message-sendmail-envelope-from set to nil to make sure user-mail-address used -- but nothing seems to matter from the sending side. (using msmtp on the send side)
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Thanks for any and all info. Or maybe just a guide that focuses on sending from multiple emails -- all the guides seem to say to skip right over the sending side of multiple emails and aliases.