Greylist problem

im testing email authentication with but receiving this errors in logs file…

May  4 09:51:31 email postgrey[1147]: action=greylist, reason=new,, client_address=,,
May  4 09:51:31 email postfix/smtpd[20925]: NOQUEUE: reject: RCPT from[]: 450 4.2.0 <>: Recipient address rejected: Greylisted, see; from=<> to=<> proto=ESMTP helo=<>

Looks normal. Greylisting is meant to delay the message and see if it’s an abusive pattern:

Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will “temporarily reject” any email from a sender it does not recognize. -Wikipedia

Now there are several threads about whitelisting folks in the greylist - check out the files in /etc/postgrey for more options in adjusting for domains you want to avoid, I personally avoid it from old customers domains so they can get me with no delay, it’s handy - too you can edit it so the system takes less the 300 seconds, may help too.