
# Reject unauthenticated relay on port 465
 drop
    condition = ${if eq{$received_port}{465}{1}{0}}
    message = SMTP AUTH is required for message submission on port 465

# Reject unauthenticated relay on port 587
 drop
    condition = ${if eq{$received_port}{587}{1}{0}}
    message = SMTP AUTH is required for message submission on port 587
