I understand that greylisting means that emails are, at first, rejected and only accepted at the second delivery attempt. This, however, means that emails are delayed, possibly by hours, depending on the time the sender takes before retrying.
Is this delay always there for all emails or does the greylisting software somehow recognize known good senders and stops greylisting these?
Any idea what the usual delays are?
Is this delay always there for all emails or does the greylisting software somehow recognize known good senders and stops greylisting these?
Any idea what the usual delays are?