Hello,
I have an issue with spam. To tackle the issue, I am going configure my Postfix-based SMTP server by enabling 'reject_non_fqdn_helo_host name', which will reject mail from clients that are not using a FQDN as their host name (such as 'localhost').
After reading Postfix's documentation on how to do this, I have a concern and hoping someone can help me out. Postfix's documentation says the following for 'reject_non_fqdn_helo_host name':
"Reject the request when the HELO or EHLO host name is not in fully-qualified domain form, as required by the RFC."
What the documentation says is incorrect. Under '3.6 Domains' of RFC 2821, it says a host name can be an address literal. So, if I use 'reject_non_fqdn_helo_host name' and a SMTP client uses an address literal for its host name, will Postfix reject the mail?
- Thanks Regards, Nikolas Kallis
