Greylist problem

1

im testing email authentication with https://www.unlocktheinbox.com/resources/emailauthentication/ but receiving this errors in logs file…

May  4 09:51:31 email postgrey[1147]: action=greylist, reason=new, client_name=unlocktheinbox.com, client_address=168.144.32.45, sender=mailtest@unlocktheinbox.com, recipient=admin@mydomain.com
May  4 09:51:31 email postfix/smtpd[20925]: NOQUEUE: reject: RCPT from unlocktheinbox.com[168.144.32.45]: 450 4.2.0 <admin@mydomain.com>: Recipient address rejected: Greylisted, see http://postgrey.schweikert.ch/help/mydomain.com.html; from=<mailtest@unlocktheinbox.com> to=<admin@mydomain.com> proto=ESMTP helo=<unlocktheinbox.com>
2

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.