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How to change the hostname and SMTP banner in Postfix on a Plesk server

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Kuzma Ivanov
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Plesk for Linux kb: how-to ABT: Group B

Applicable to:

  • Plesk for Linux

Question

  • How to change the hostname in Postfix on a Plesk server?

  • How to change the SMTP banner in Postfix on a Plesk server?

Answer

  1. Connect to a Plesk server via SSH.

  2. For security reasons, create a backup file of the Postfix configuration file main.cf:

    # cp /etc/postfix/main.cf /etc/postfix/main.cf.bak

  3. Open the main.cf file in a text editor. In this example, we are using the vi editor:

    # vi /etc/postfix/main.cf

  4. Add/modify the Postfix configuration parameters myhostname and smtpd_banner the following way:

    CONFIG_TEXT: myhostname = server.example.com
    smtpd_banner = $myhostname ESMTP $mail_name

    Note: Make sure that other myhostname and smtpd_banner parameters are disabled (contain # at the beginning of the line).

  5. Save the changes and close the file.

  6. Check Postfix configuration syntax:

    # postfix check
    (empty output - means syntax is OK)

  7. Restart Postfix:

    # service postfix restart

Comments

9 comments

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  • Avatar
    Hassan Oumar

    Way is my comment deleted?

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    Alexandr Nikolaenko

    Hello @Hassan Oumar

    The only your comment is in Emails are sent with a wrong hostname in a sender address from a Plesk for Linux server with Postfix article and it was already answered.

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    Dennis Molina Arguedas

    Hello. 

    Does is possible to send a different sender hostname fo each domain that is hosted on a server?

    For example the domain domain.com send the SMTP hostname as mail.domain.com and example.com send as mail.example.com and not use a general hostname for example: mail.server.com

    Thanks in advance for all your help! 

     

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    Ivan Postnikov

    Hello Dennis Molina Arguedas

    Please, check the section "Send from domain IP addresses and use domain names in SMTP greeting" in the article https://support.plesk.com/hc/en-us/articles/213905445

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    Dennis Molina Arguedas

    Thanks Ivan.

     

    I'll check it. 

    Thanks for your reply! 

    However I used a main server name as SMTP name server in order to send all the emails with this sign, with the PTR pointing to the main record. 

     

    Best Regards.

     

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    Riccardo Di Roberto

    Hello, is this fix persistent or it will be wiped out by the first Plesk micro-update? Main.cf file seems to be overwritten pretty often. Thanks.

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    George Thalassinos

    Thanks Kuzma Ivanov,

    Your answer solved my problem with MXTOOLBOX regarding the SMTP Banner check.

    Regards

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    Ivan Postnikov

    Hello Riccardo Di Roberto

    It depends on the changes in a particular update. Indeed, there's a possibility that some updates will wipe manual changes. You may use 3rd-party software to automatically restore changes in main.cf.

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    Herbert Metzendorff

    What else do I have to change after this? I have existing mail accounts, did your proposed changes. But after that I could not receive mails and senders got the reply, that user "info" (my mail account) does not exist. It seems that plesk maps accounts with the hostname.

     

    thanks for your help in advance

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