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postfix-srs fails to reverse addresses: Hash invalid in SRS address

Vladimir Chernikov

Updated February 20, 2019 15:10

Applicable to:

Plesk Onyx for Linux

Symptoms

Forwarded messages from some domains not delivered.
The following messages can be found in mail log:
CONFIG_TEXT: postfix-srs: [srs0=lyd5=qz=example.com=bounces 337318-83a0-test=example.com@example.com] not rewritten: Hash invalid in SRS address.
The original rewriteable line contains the "+" symbol:

CONFIG_TEXT: [SRS0=LYD5=QZ=example.com=bounces+337318-83a0-test=example.com@example.com]

Cause

This is Plesk bug with ID #PPPM-10128 which will be fixed in future Plesk updates.

Resolution

As a workaround, disable SRS as described in the following article:

How to turn off Sender Rewriting Scheme support?

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