[Zope] Mailhost and relay problem.

[Paolo Dina]

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 at 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