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Bounce email message received: your rDNS doesn't match with domain sending mail

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Renan Moreira
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Plesk for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk Onyx for Linux
  • Plesk for Linux

Symptoms

  • Bounce email message is received with following information:

    CONFIG_TEXT: your rDNS doesn't match with domain sending mail
    You IP address 203.0.113.2 is associated to domain mail.example.com.
    Howerver, your email has been sent from example.org.
    Maybe you might want to change DNS (PTR type) and your server hostname to same value.
    Here values used to make this test:
    IP: 203.0.113.2
    HELO: example.org
    rDNS: mail.example.com

  • SMTP HELO greeting contains the Plesk hostname, which is configured in Tools & Settings > Server Settings > Full hostname:

    CONFIG_TEXT: example.org

  • Sender domain example.com is hosted in Plesk and resolves to following IP address:

    # dig @8.8.8.8 example.com +short
    203.0.113.2

  • PTR record for example.com IP resolves to mail.example.com:

    # dig @8.8.8.8 -x 203.0.113.2 +short
    mail.example.com.

  • Tools & Settings > Mail Server Settings > Outgoing mail mode is set to Send from domain IP addresses

Cause

Plesk is configured to use Plesk hostname for SMTP greeting, therefore rDNS lookup on sender IP doesn't match because it resolves to a different domain.

Resolution

Warning: Selecting this option may result in mail sent from some or all domains being marked as spam if the destination mail server uses cbl and more than one domain on the Plesk server uses the same IP address.

  1. Login into Plesk
  2. Go to Tools & Settings > Mail Server Settings
  3. Set Outgoing mail mode option to Send from domain IP addresses and use domain names in SMTP greeting and click OK to apply changes.
Click here to see the additional information.
Domain mail tester shows: host with no rDNS

Comments

4 comments

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  • Avatar
    Edwynn Flores Martínez

    I use Plesk Obsidian  and I don't see this option in my control panel

    1.- Set Outgoing mail mode option to Send from domain IP addresses and use domain names in SMTP greeting and click OK to apply changes.

     
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  • Avatar
    Alexey Lapshin

    Hello @Edwynn Flores Martínez,

    The option available in case Postfix mail server is installed at Tools & Settings > Mail Server Settings.

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  • Avatar
    Edwynn Flores Martínez

    Hi @Alexey Lapshin

    I need to match the rdns with Helo. In my vps I have many domains from the same ip. The second option work for me. Send for domain Ip address and use domain names im SMTP greetings.

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  • Avatar
    Edwynn Flores Martínez

    I solved my problem by pointing the reverse DNS and naming my vps in :

    Tools and Setting > Server Settings> Change the Full hostname.
    It should be the same for Helo and rdns option.

    The test should be done at mail-tester.com to verify that everything is fine.

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