Hi, this is the scenario. I have implemented a sort of simple newsletter manager for my site based on double optin, so users can subscribe, remove and modify their account info easily. The problem arise when mailserver must send to subscriber the mail that confirm their subscription. To do so i use mailhost, that gives this error message: smtplib.SMTPRecipientsRefused on {'subscriber@domain.tld': (550, '5.7.1 ... we do not relay ')} in "", at line 35, column 1 This happens because mailserver need that account that send mail gives his credentials, username and password. This is called "POP before SMTP". Now, is there an easy way to accomplish this authentication? Do you think that a python script could help? How..? Thankyou Paolo Dina