On that page we are almost identical with cases, the exception being:
Outgoing Mail Server (SMTP)Account: Verizon
….whereas I am lower case
Account: telus
My recollection is that my settings were supplied by my ISP when I set up Mail.
I think I had tp play around with port numbers, but that's it.
I've been meaning to ask if you've raised this issue because of a problem or just out of curiosity?