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

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Vladimir Chernikov
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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?

Comments

2 comments

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  • Avatar
    Michel Otte

    Hi,

    Any ETA on a fix or possibly a valid workaround? The suggested workaround is not really an option as it breaks when SPF is used on the sender domain. This was not an issue with Plesk Onyx 17.5 with the suggested workaround to install postsrsd and a custom plesk-pc-mail-driver.

    Regards,
    Michel

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    Alexey Lapshin

    Hello Michel,

    I totally understand your concern.
    The issue #PPPM-10128 is quite rare, thus our development team decided to postpone the fix for the time being.

    I appreciate your understanding.

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