Forwarded to devs VERP keeps getting reset during upgrade

[mow]

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TITLE

VERP keeps getting reset during upgrade

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE

Product version: Plesk Obsidian 18.0.44.3
Product version: Plesk Obsidian 18.0.47.5
OS version: Debian 11.5 x86_64

PROBLEM DESCRIPTION

In Server-wide mail settings, the checkbox
Enable email subaddressing This option enables an ability to configure [URL='https://en.wikipedia.org/wiki/Variable_envelope_return_path']VERP-style[/URL] email addresses for mail lists
keeps getting reset to Off on Plesk updates.
This happened during the update from Debian 9 to 10 to 11, and just now again during the update from 18.0.44.3 to 18.0.47.5.

Not having VERP-style addresses enabled when those are heavily used (by the ERP system, to track orders and bounces and stuff) leads to loss of important emails. I hope I don't need to explain why this is BAD.

STEPS TO REPRODUCE

Update Plesk

ACTUAL RESULT

VERP-Checkbox off

EXPECTED RESULT

VERP-Checkbox keeps the previous setting

ANY ADDITIONAL INFORMATION

(DID NOT ANSWER QUESTION)

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM

Confirm bug

 

[IgorG]

Developers have tried to reproduce the issue but can't. The 'email subaddressing' option is enabled after the upgrade, checked on Debian 11.
Please contact Plesk Support Team to investigate the issue directly on your server.