Symptoms
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Emails that are sent locally inside the server (emails from Plesk administrator, local domains or web forms) are rejected or moved to the spam folder with the following records in
/var/log/maillog:dmarc[15768]: Starting the dmarc filter...
dmarc[15768]: DMARC: REJECT message for john_doe@example.com
postfix-local[15764]: message discarded by a mail handler
dk_check[15713]: Starting the dk_check filter...
dk_check[15713]: DKIM verify result: DKIM Feed: No signature
dmarc[15714]: Starting the dmarc filter...
dmarc[15714]: SPF record was not found in Authentication-Results:
dovecot: service=lda, user=john_doe@example.com, ip=[]. msgid=[20191029070309.A4B6925F@ns1.example.com]: saved mail to INBOX.Spam
dmarc[15714]: DMARC: message moved to QUARANTINE for john_doe@example.com
postfix-local[15648]: message discarded by a mail handler -
The DMARC policy is set as "p=quarantine" (treat with suspicion) or "p=reject" (block outright) in Plesk at Domains > example.com > DNS Settings.
_dmarc.example.com. TXT v=DMARC1; p=quarantine
Cause
This is a Plesk bug with ID PPPM-7190, which is planned to be fixed in future product updates.
Resolution
Apply one of the following workarounds:
Workaround I
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Check the "Return-Path" value from the email header which was moved to spam:
Return-Path: <mail@example.com>
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Connect to the Plesk server via SSH.
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Whitelist the domain from "Return-Path" by adding its name to the "IgnoreMailFrom" string in the file
/etc/psa/dmarc.conf:3.1. Create the file
/etc/psa/dmarc.conf:# touch /etc/psa/dmarc.conf
3.2. Open the file in a text editor. In this example, we are using the vi editor:
# vi /etc/psa/dmarc.conf
3.3. Add the required domains as a line after 'IgnoreMailFrom':
Note: Replace example.com with actual domain name(s).
IgnoreMailFrom example.com, example.net, example.org
3.4. Save the changes and close the file.
Workaround II
Modify the DMARC record of the recipient domain: Change "p=quarantine" or "p=reject" to "p=none" at Domains > example.com > DNS Settings.