Applicable to:
- Plesk for Linux
Symptoms
-
Plesk Notifications are bounced with one of the following error messages:
CONFIG_TEXT: <mail-reports@example.com>: host smtp.example.com[203.0.113.2] said: 550 Messages
should have one or no Content-Type headers, not 2. (in reply to end of DATA
command)
CONFIG_TEXT: INVALID HEADER
Duplicate header field: "Content-Type" -
If Plesk Email Security Extension is installed, the following error might be shown in the log file
/var/log/maillog
:CONFIG_TEXT: amavis[15703]: (15703-13-2) Blocked BAD-HEADER-0 {BouncedInbound,Quarantined}
-
Analyzing the mail header of a Plesk Notification, it includes the
Content-Type
twice:CONFIG_TEXT: ...
Content-Type: text/html;
charset="UTF-8"
MIME-Version: 1.0
Content-Type: text/html;
charset="UTF-8"
...
Cause
Product issue:
-
#PPPM-11530 "Email notifications sent by Plesk servers no longer contain the duplicate “Content-Type” header, which caused them to be bounced during local delivery."
Fixed in:- Plesk Obsidian 18 February 2020
Resolution
Workaround
As a workaround, disable the Plesk HTML notifications in Plesk Panel.ini file:
Click on a section to expand
-
Go to Extensions > My Extensions > Panel.ini Editor > Open > Editor tab > Add the following configuration > Click Save to apply the changes:
CONFIG_TEXT: [notification]
htmlEmail = false
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