MailEnable autoresponder does not send an autoreply.
In MailEnable Management > Servers > localhost > Servers and Connectors > SMTP > Logs > Activity > SMTP-Activity-date.log following message can be found:
127.0.0.1 AUTH xxxxx 504 Invalid Username or Password 34 18 postmaster@localhost
Account postmaster@localhost is missed in MailEnable Management.
Go to MailEnable Management > Messaging Manager > Post Offices and check whether postmaster user exists under localhost domain. If postmaster user does not exist:
- Delete localhost domain from MailEnable Management.
- Disable and enable option Use the mail server installed with Plesk and the default mail account created by Plesk in Plesk > Tools & Settings > External SMTP Server.
Domain postmaster@localhost will be recreated automatically in MailEnable Management.