Authentication required

[cyberzork]

Try the suggested post from @Gary below on this subject via “Menu / Accounts”.

authentication required (VM401)

Two things you can try: Go to Menu > Tools > Accounts and click on the SMTP tab. Make sure the port is set to 587 , and the security policy is set to Force usage of SSL/TLS. If that does not help, disable your anti-virus application and try again.