setting default email server for mac mail v.16
I'm on a Mac OS 13.2.1 using Mail v16. I have multiple email accounts but assign all outgoing messages to my main email account. Yet the app is suddenly assigning outgoing emails to another server when I compose. I've looked everywhere to find a place where I can re-assign the default server. I've done it before but can't find the prompt anywhere on Mail>Settings or Mail>Accounts. Any suggestions?