POP3 with Fetchmail scores each mail with RDNS_NONE(1.274)

[Steffen Hildinger]

When collecting mails via fetchmail, all mails are rated with a score of 1.274.
Message in Quarantine: Delivered to internal network by a host with no rDNS.

All IPs and domains can be resolved. 127.0.0.1 to localhost.

How to fix or disable rdns lookup in case of fetchmail?

Thanks in advance.

LOG:
Oct 21 12:12:43 mg01 fetchmail[499]: 5916 messages (5915 seen) for REMOVED@gmx.de at proxmox0000 (500230699 octets).
Oct 21 12:12:43 mg01 postfix/postscreen[16300]: CONNECT from [172.21.1.100]:42936 to [172.21.1.100]:25
Oct 21 12:12:43 mg01 postfix/postscreen[16300]: WHITELISTED [172.21.1.100]:42936
Oct 21 12:12:43 mg01 postfix/smtpd[16301]: connect from mg01.REMOVED.local[172.21.1.100]
Oct 21 12:12:43 mg01 postfix/smtpd[16301]: 134891C0C6B: client=mg01.REMOVED.local[172.21.1.100]
Oct 21 12:12:43 mg01 postfix/cleanup[16304]: 134891C0C6B: message-id=<1285456800.29521931.1571651369047@rnd-11.broadmail.live>
Oct 21 12:12:43 mg01 postfix/qmgr[296]: 134891C0C6B: from=<return@mailing.dhl.de>, size=49663, nrcpt=1 (queue active)
Oct 21 12:12:43 mg01 fetchmail[499]: reading message REMOVED@gmx.de@pop.gmx.net:5916 of 5916 (49292 octets) not flushed
Oct 21 12:12:43 mg01 postfix/smtpd[16301]: disconnect from mg01.REMOVED.local[172.21.1.100] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Oct 21 12:12:43 mg01 pmg-smtp-filter[14095]: 2019/10/21-12:12:43 CONNECT TCP Peer: "[127.0.0.1]:59736" Local: "[127.0.0.1]:10024"
Oct 21 12:12:43 mg01 pmg-smtp-filter[14095]: 1C0D4D5DAD849B30B5D: new mail message-id=<1285456800.29521931.1571651369047@rnd-11.broadmail.live>
Oct 21 12:12:43 mg01 clamd[461]: SelfCheck: Database status OK.
Oct 21 12:12:43 mg01 clamd[461]: SelfCheck: Database status OK.
Oct 21 12:12:46 mg01 pmg-smtp-filter[14095]: 1C0D4D5DAD849B30B5D: SA score=3/5 time=3.375 bayes=undefined autolearn=no autolearn_force=no hits=AWL(1.174),DKIMWL_WL_MED(-0.001),DKIM_SIGNED(0.1),DKIM_VALID(-0.1),DKIM_VALID_AU(-0.1),DKIM_VALID_EF(-0.1),HTML_IMAGE_RATIO_02(0.001),HTML_MESSAGE(0.001),HTML_TEXT_INVISIBLE_STYLE(1.747),KAM_SHORT(0.001),RCVD_IN_DNSWL_NONE(-0.0001),RDNS_NONE(1.274),SPF_HELO_PASS(-0.001),SPF_PASS(-0.001)
Oct 21 12:12:47 mg01 pmg-smtp-filter[14095]: 1C0D4D5DAD849B30B5D: moved mail for <REMOVED> to spam quarantine - 1C0D845DAD849EF39A0 (rule: Quarantine/Mark Spam (Level 3))
Oct 21 12:12:47 mg01 pmg-smtp-filter[14095]: 1C0D4D5DAD849B30B5D: processing time: 3.867 seconds (3.375, 0.242, 0)
Oct 21 12:12:47 mg01 postfix/lmtp[16305]: 134891C0C6B: to=<REMOVED>, relay=127.0.0.1[127.0.0.1]:10024, delay=4, delays=0.07/0.01/0.04/3.9, dsn=2.5.0, status=sent (250 2.5.0 OK (1C0D4D5DAD849B30B5D))
Oct 21 12:12:47 mg01 postfix/qmgr[296]: 134891C0C6B: removed

 

[Stoiko Ivanov]

Could you try to enter an entry in '/etc/hosts' for 172.21.1.100?

 

[Steffen Hildinger]

It is already set for full qualified and hostname.

 

[Stoiko Ivanov]

You could try running spamassassin in debug mode on one of these messages (the whole messages as .eml)
see https://cwiki.apache.org/confluence/display/spamassassin/TrustedRelays
for an explanation

 

[Kastor89]

Hello Steffen,
did you find a solution for this behaviour?
I have the same problem with a fetchmail setup and PMG 5.2-7.

Maybe it is possible with a template for the spamassassin config to set "score RDNS_NONE 0"?!

 

[Kastor89]

Copy /var/lib/pmg/templates/local.cf.in to /etc/pmg/templates/
Add score RDNS_NONE 0 to that file and sync config with # pmgconfig sync --restart 1

Works for me. Cheers.

 

[Stoiko Ivanov]

Thanks for reporting back with your solution.
With PMG 6.1 you could use the Custom Rule score for this solution: https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmgconfig_spamdetector_customscores (via GUI)