Email malfunction after enabling greylisting

[vospy]

Hi,

I'm using Plesk 12.5.30 on a virtual server with Ubuntu 14.04.3 LTS. After I enabled greylisting filter for emails, all mails will be rejected and I can't receive emails anymore. Not only the first try of the foreign server to deliver mails fails, also any later try fails. If I disable greylisting, I can receive mails without any problem.


The log says something about "greylisting filter", but I don't know why and I don't know what's the problem.

Jan  7 03:40:02 h1335577 postfix/smtpd[3132]: connect from mailout.sender.tld[1.2.3.4]
Jan  7 03:40:02 h1335577 postfix/smtpd[3132]: 4D5162D520BE5: client=mailout.sender.tld[1.2.3.4]
Jan  7 03:40:02 h1335577 greylisting filter[3188]: Starting greylisting filter...
Jan  7 03:40:02 h1335577 greylisting filter[3188]: Unable to execute update from data table query: unable to open database file
Jan  7 03:40:02 h1335577 greylisting filter[3188]: Unable to update record into data table
Jan  7 03:40:02 h1335577 greylisting filter[3188]: Unable to create record into data GL table
Jan  7 03:40:02 h1335577 /usr/lib/plesk-9.0/psa-pc-remote[938]: handlers_stderr: DEFER
Jan  7 03:40:02 h1335577 /usr/lib/plesk-9.0/psa-pc-remote[938]: DEFER during call 'grey' handler
Jan  7 03:40:02 h1335577 /usr/lib/plesk-9.0/psa-pc-remote[938]: Message aborted.
Jan  7 03:40:02 h1335577 postfix/smtpd[3132]: 4D5162D520BE5: milter-reject: DATA from mailout.sender.tld[1.2.3.4]: 451 4.7.1 Service unavailable - try again later; from=<name@sender.tld> to=<to@recipient.mail> proto=ESMTP helo=<mailout.sender.tld>
Jan  7 03:40:02 h1335577 postfix/smtpd[3132]: disconnect from mailout.sender.tld[1.2.3.4]
Jan  7 03:40:12 h1335577 dovecot: imap-login: Login: user=<to@recipient.mail>, method=DIGEST-MD5, rip=127.0.0.1, lip=127.0.0.1, mpid=4530, secured, session=<ApPUY7UoWQB/AAAB>
Jan  7 03:40:12 h1335577 dovecot: service=imap, user=to@recipient.mail, ip=[127.0.0.1]. Disconnected: Logged out rcvd=136, sent=998

The info (out of "ps aux") about process 3188:

postfix  3188  0.0  0.0  13744  1596 ?  R  03:40  0:00 /opt/psa/handlers/hooks/grey none name@sender.tld to@recipient.mail

Can anybody help me?

Thanks a lot.

Best regards.