is added to the e-mail headers.X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0
or
X-Greylist: delayed 00:10:20 by SQLgrey-1.8.0
after some investigation i found an problem in /etc/postfix/main.cf.
under smtpd_recipient_restrictions i was using "check_recipient_access hash:/etc/posfix/recipient_access" to block invalid recipients.
the default action in recipient_access is "REJECT".
i added this option BEFORE "check_policy_service inet:127.0.0.1:2501"
the result is: sqlgrey is running but never called.
i switched the position in smtpd_recipient_restrictions to have check_recipient_access to be the last and sqlgrey is working fine!
Keep in mind
Greetz