[RFCI-Discuss] postmaster policy and envelope sender rejection

[Mark]

Hi,

I'm seeking some advice/opinions regarding the rejection of envelope 
senders in light of the postmaster policy.

Could rejecting MAIL FROM immediately, without waiting to see if the 
recipients might be rfc2142 addresses, be reason for listing?

Reasons for rejection might be violation of SPF records, sender address 
verification callout failure or local blacklisting of certain sender 
addresses. The reason for rejection is explained in the 550 message.

Regards,
Mark.