How to fix mail to particular contacts not appearing in Sent folder? On Mountain Lion's Mail, I am having a problem with the messages I send to a particular coworker from my work account not appearing in the Sent mailbox.


The messages are going through. (I got her to Fwd: the important one back to me.)
Messages I sent to my other accounts, even from that account, are correctly appearing in Sent.
Messages I send from another address (even using the same SMTP server) are appearing in Sent.


Things I've tried so far:


Connection Doctor. It shows no issues.
Deleting + recreating the account.
Rebuilding the mailbox.
I'm familiar with Use This Mailbox For > and it is not a factor here.


Any ideas?
This appears to have been a hiccup on the SMTP server.