This is bizarre and it has just started this morning. I've replied to two messages and even though the To address clearly shows the sender when I reply, Mail is instead sending the message back to me and not the sender!
In other words, I get a message from "joe" and hit reply. The To: field in my reply shows "Joe" and I click Send. A few minutes later I get the reply addressed to me with no trace of "Joe" anywhere in the "To" header information. I go and look at my Sent messages and the reply to Joe now shows that my name is in the To field.
WTF?!?!??!?!
In other words, I get a message from "joe" and hit reply. The To: field in my reply shows "Joe" and I click Send. A few minutes later I get the reply addressed to me with no trace of "Joe" anywhere in the "To" header information. I go and look at my Sent messages and the reply to Joe now shows that my name is in the To field.
WTF?!?!??!?!