This is default Postfix behavior. The resulting delay is almost an hour.
Feb 23 14:48:06 smtp postfix/smtp[12484]: CBD762FC08E: host
mx3.redhat.com[66.187.233.32] said: 451 4.7.1 greylisted for 30 minutes
and 0 seconds. (in reply to end of DATA command)
Feb 23 15:13:37 smtp postfix/smtp[12562]: CBD762FC08E: host
mx3.redhat.com[66.187.233.32] said: 451 4.7.1 greylisted for 4 minutes
and 29 seconds. (in reply to end of DATA command)
Feb 23 15:46:51 smtp postfix/qmgr[21670]: CBD762FC08E:
from=<Fedora@xxxxxxxxxxx>, size=3016, nrcpt=1 (queue active)
Feb 23 15:46:57 smtp postfix/smtp[12601]: CBD762FC08E: to=<fedora-
list@xxxxxxxxxx>, relay=mx3.redhat.com[66.187.233.32], del
ay=3537, status=sent (250 2.0.0 j1NKkuvA011344 Message accepted for
delivery)
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