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Excessive SRS header is displayed in From field in mail clients for some forwarded emails

In the forwarded email message there is excessive "From: SRS" header:

From: [email protected]
Some mail clients (e.g. Microsoft Outlook or Thunderbird) can display this header in the From field:

Product issue:

#PPPM-13296 "Mail messages forwarded from a Plesk server, or from one mail account to another on the same Plesk server no longer includes an unnecessary duplicate “From:” header."
Fixed in:
- Plesk Obsidian 23 November 2021 (Linux)

Please consider updating your server:

If update is not possible for some reason you may try the following

Connect to the server via SSH;
Disable add-from mail handler:

# plesk sbin mail_handlers_control --disable --name add-from --type global --queue before-sendmail

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