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Unable to send or receive e-mail messages: Hostname is not valid. Please set a hierarchical, dot-separated domain as the hostname

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Julian Bonpland Mignaquy
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Plesk for Linux kb: technical ext: pes ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Unable to send or receive e-mails from remote mail addresses.

  • Customer in Plesk is unable to access Plesk Email Security extension, the following error message is displayed:

    Hostname is not valid. Please set a hierarchical, dot-separated domain as the hostname!

  • The following error messages can be found in /var/log/maillog:

    hostname postfix/smtpd[36515]: NOQUEUE: reject: RCPT from unknown[203.0.113.2]: 450 4.7.25 Client host rejected: cannot find your hostname, [203.0.113.2]; from=sender@example.net.com to=receiver@example.com proto=ESMTP helo=<info.example.com>

    OR

    Nov 12 02:10:38 postfix/error[29408]: BA72F106ECA4: to=johndoe@example.com, relay=none, delay=105489, delays=105488/0.19/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)

Cause

The server hostname must be a fully qualified domain name (FQDN). The hostname may either be incorrectly configured in Tools & Settings > Server Settings > Hostname or via hostname command.

Resolution

  1. Log into Plesk.

  2. Go to Tools & Settings > Server Settings and set a Full hostname.
    If hostname already set, change it to some random one (ex. test.example.com) and then change back to correct hostname. This will trigger the change to /etc/hostname as well.

  3. Open Plesk Email Security in Extensions > My extensions > Plesk Email Security > Open

  4. Click the button Install Now!

Additional information

Server with Plesk Email Security no longer sends/receives emails: [127.0.0.1]:10024: Connection refused

Comments

6 comments

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  • Avatar
    Oliver Latson

    Hi there,

    I did your recommended steps but I have and always had an FQDN and after reinstalling the extinsion it still says I would have an invalid hostname.
    Do you have any further suggestions?

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  • Avatar
    Til Wegener

    Doesnt work for me. How can i fix it?

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  • Avatar
    Alisa Kasyanova

    @Oliver Latson @Til Wegener

    Check the /etc/hostname file: it may be edited manually, so Plesk is showing an FQDN hostname, while in fact it is changed to non-FQDN.

    If /etc/hostname also has an FQDN hostname, please create a request to our support and we will investigate the issue further.

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  • Avatar
    Til Wegener

    @... Thank you, that was the solution.

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  • Avatar
    Oliver Latson

    Hi Alisa,

    yes I can confirm it also.

    Thank you for your advice.
    I seperately had to install libdbd-mysql-perl but  then I was able to start amavis service and reinstall the Plesk email security extension.

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    dicara

    J'ai eu le même chose 

    J ai copier coller le host name toujours rien ..

     

    Puis j ai recopier manuellement sans le point-virgule

    Maintenant tous est ok 

     

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