I've been having a similar difficulty; only I'm a little further along in this frustrating exercise.
Any suggestions to remedy Error 1503, "Error with SSL" ? I'm Okay with the E-mail client, but cannot get SMTP to perform...
Anyone seen and successfully worked around this issue? The effort is on behalf of a not-for-profit enterprise, I hope an answer lies in FMP Advanced 11 and I won't have to shop and adopt a third-party workaround.
Thanks in advance for your assistance!