I'm sure he's taking about the sending account because the recipient wouldn't matter, plus he's talking about authentication issues, at least for his own server.
@zupfox, I don't believe even pre-1.4 Do-Mores will email from a Gmail account, because Gmail uses separate POP and SMTP server urls, but uses POP before SMTP login. Until 1.4, this was a combination that would confound Do-More. As of v1.4, Do-More has added the ability to DEVWRITE the POP server IP address, so using Gmail accounts should now be possible, but I haven't tried it yet.
Also note that if you use DNSLOOKUP or other asynch instruction, be sure to put it in a code block that stays enabled until the asynch instruction succeeds or fails. I learned this by error (not trial & error, just error).