I see. Thank you for the explanation. So the right way to state this is
that HELO/EHLO requires a valid FQDN/hostname only for MTAs, and for
MUAs it's just ignored because authentication is what matters.
Cheers,
Sam
On 23/12/2022 9:34 AM, Peter wrote:
On 23/12/22 15:48, Samer Afach wrote:
Got it. So HELO/EHLO is specifically for MTAs. Thank you very much
for explaining!
It still needs to be sent for submission connections, but the hostname
does not have to be a legitimate FQDN. What is important for
submission is that it passes some other form of authentication, such
as SASL AUTH.
Peter
