no, i've tried several
I've tried that. I just went in and retyped the password. However, on the Outgoing Mail Server, my e-mail service provider requires authentication. When I tap "authentication" on the iPhone, it replies "MD5 Challenge-Response" "NTLM" and "HTTP Md5 Digest" all of which is meaningless to me. Where it says "password", which seems to be highlighted, there is a check mark. I get the impression this means it is using the login.
I went back and entered the "optional" username and password. Lo and behold, I was then able to send an e-mail message successfully. Thanks for your encouragement, and confirmation that the problem was in the outgoing mail server. It gave me encourage to keep trying. It was difficult to get the password XXXXX "stick." I don't know why, but once it stayed put, the problem seemed to have been overcome.
Thanks very much.