Proxmox Mail Gateway can check the DKIM signature of the sender

O

othmane el kheiar

New Member
Mar 3, 2023
20
1
3
Hi,

I have a question about DKIM signature.

when a message is coming to proxmox mail gateway , it can check the DKIM signature of the sender ?

is enabled by default or i have some steps to enable DKIM verification of sender in Proxmox Mail Gateway.


my version : Mail Gateway 7.2-1

Thank you.
 
check the logs of such a mail - pmg-smtp-filter will print which spamassassin rules hit - and there are rules which trigger on DKIM
 
I have an example of an email received from offresonline@offresonline.com.





Mar 13 10:36:32 pmg postfix/smtpd[174470]: connect from tbjjbihbhfcci.turbo-smtp.net[199.187.175.228]
Mar 13 10:36:33 pmg postfix/smtpd[174470]: BC728E1115: client=tbjjbihbhfcci.turbo-smtp.net[199.187.175.228]
Mar 13 10:36:34 pmg postfix/cleanup[174479]: BC728E1115: message-id=<64-0124d6b5-0000183cc9641e012001-001-398c8029@serversmtpbond.com>
Mar 13 10:36:34 pmg postfix/qmgr[37966]: BC728E1115: from=<offresonline@offresonline.com>, size=7665, nrcpt=1 (queue active)
Mar 13 10:36:34 pmg pmg-smtp-filter[145269]: E1122640EEEA246086: new mail message-id=<64-0124d6b5-0000183cc9641e012001-001-398c8029@serversmtpbond.com>#012
Mar 13 10:36:34 pmg postfix/smtpd[174470]: disconnect from tbjjbihbhfcci.turbo-smtp.net[199.187.175.228] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Mar 13 10:36:37 pmg pmg-smtp-filter[145269]: E1122640EEEA246086: SA score=0/5 time=2.925 bayes=undefined autolearn=ham autolearn_force=no hits=AWL(0.533),DKIM_SIGNED(0.1),DKIM_VALID(-0.1),DKIM_VALID_AU(-0.1),DKIM_VALID_EF(-0.1),HTML_MESSAGE(0.001),HTML_TAG_BALANCE_BODY(0.1),MIME_HTML_ONLY(0.1),RCVD_IN_DNSWL_HI(-5),SPF_HELO_NONE(0.001),SPF_PASS(-0.001),URIBL_BLOCKED(0.001)
Mar 13 10:36:37 pmg postfix/smtpd[174505]: connect from localhost.localdomain[127.0.0.1]
Mar 13 10:36:37 pmg postfix/smtpd[174505]: 5C6ACE112A: client=localhost.localdomain[127.0.0.1], orig_client=tbjjbihbhfcci.turbo-smtp.net[199.187.175.228]
Mar 13 10:36:37 pmg postfix/cleanup[174476]: 5C6ACE112A: message-id=<64-0124d6b5-0000183cc9641e012001-001-398c8029@serversmtpbond.com>
Mar 13 10:36:37 pmg postfix/qmgr[37966]: 5C6ACE112A: from=<offresonline@offresonline.com>, size=8995, nrcpt=1 (queue active)
Mar 13 10:36:37 pmg pmg-smtp-filter[145269]: E1122640EEEA246086: accept mail to <info@attime-technologies.com> (5C6ACE112A) (rule: default-accept)
Mar 13 10:36:37 pmg postfix/smtpd[174505]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
Mar 13 10:36:37 pmg pmg-smtp-filter[145269]: E1122640EEEA246086: processing time: 3.142 seconds (2.925, 0.078, 0)
Mar 13 10:36:37 pmg postfix/lmtp[174481]: BC728E1115: to=<info@attime-technologies.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=4.3, delays=1/0.03/0.05/3.2, dsn=2.5.0, status=sent (250 2.5.0 OK (E1122640EEEA246086))
Mar 13 10:36:37 pmg postfix/qmgr[37966]: BC728E1115: removed
Mar 13 10:36:37 pmg postfix/smtp[174507]: 5C6ACE112A: to=<info@attime-technologies.com>, relay=192.168.11.101[192.168.11.101]:25, delay=0.27, delays=0.05/0.03/0/0.19, dsn=2.6.0, status=sent (250 2.6.0 <64-0124d6b5-0000183cc9641e012001-001-398c8029@serversmtpbond.com> [InternalId=2632814952449, Hostname=EX-SRV.offresonline.net] 10331 bytes in 0.108, 92,889 KB/sec Queued mail for delivery)
Mar 13 10:36:37 pmg postfix/qmgr[37966]: 5C6ACE112A: removed
 
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