Q: Wrong contact name appears in to line.

Hello lllaass, the "to" line as in the recipients. The same thing happens when I enter the address in the CC and BCC lines.

Didn't see the bottom part of your last comment. To your question, yes, the auto complete enters contact names that I haven't saved and that are incorrect. For instance, my email address auto corrects to "Holidays in the United States", Mac mail appears to associate this term as the contact name for my email address and I cannot enter my address without it correcting to "Holidays in the United States".