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Mail form or mail forwarding does not work on Plesk server: execve(/usr/lib/plesk-9.0/sendmail/sendmail.postfix) failed: Permission denied [13]

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Leonid Gukhman
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Plesk for Linux kb: technical ABT: Group B

Applicable to:

  • Plesk for Linux

Symptoms

  • Mail forwarding or mailing form on a website hosted in Plesk does not work.

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

    CONFIG_TEXT: sendmail[16679]: my_popen(): execve(/usr/lib/plesk-9.0/sendmail/sendmail.postfix) failed: Permission denied [13] sendmail[16679]: Unable to execute MTA

    CONFIG_TEXT: plesk sendmail[2118]: Unable to save stdin content to temporary file
    plesk sendmail[2120]: cannot create temporary file - (13) Permission denied

  • The permissions for sendmail.postfix or postfix-sendmail-wrapper files are set as follows:

    • on CentOS/RHEL-based distributions:

      # stat /usr/lib64/plesk-9.0/sendmail/sendmail.postfix
      Access: (0750/-rwxr-x---) Uid: ( 0/ root) Gid: ( 0/ root)

      # stat /usr/lib64/plesk-9.0/postfix-sendmail-wrapper
      Access: (4750/-rwsr-x---) Uid: ( 0/ root) Gid: ( 0/ root)

    • on Debian/Ubuntu-based distributions

      # stat /usr/lib/plesk-9.0/sendmail/sendmail.postfix
      Access: (0750/-rwxr-x---) Uid: ( 0/ root) Gid: ( 1010/postdrop)

      # stat /usr/lib/plesk-9.0/postfix-sendmail-wrapper
      Access: (4750/-rwsr-x---) Uid: ( 0/ root) Gid: ( 1010/postdrop)

Cause

Incorrect permissions or ownership on the Sendmail binary files.

Resolution

  1. Connect to the server via SSH.

  2. Set the correct permissions:

  • on CentOS/RHEL-based distributions

    # chown root:root /usr/lib64/plesk-9.0/sendmail/sendmail.postfix && chmod 755 /usr/lib64/plesk-9.0/sendmail/sendmail.postfix
    # chown root:root /usr/lib64/plesk-9.0/postfix-sendmail-wrapper && chmod 4755 /usr/lib64/plesk-9.0/postfix-sendmail-wrapper

  • on Debian/Ubuntu-based distributions

    # chown root:root /usr/lib/plesk-9.0/sendmail/sendmail.postfix && chmod 755 /usr/lib/plesk-9.0/sendmail/sendmail.postfix
    # chown root:root /usr/lib/plesk-9.0/postfix-sendmail-wrapper && chmod 4755 /usr/lib/plesk-9.0/postfix-sendmail-wrapper

Comments

2 comments

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  • Avatar
    Martin Burggraf

    We have a few servers, on which the permissions of these files get changed regularly.

    What kind of process may be responsible for this behaviour and is there a way to have plesk fix this permanently?

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  • Avatar
    b_p

    Leonid Gukhman on Ubuntu 20.04 the permissions are set as follows (by default):

    File: /usr/lib/plesk-9.0/sendmail/sendmail.postfix
    Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)

    File: /usr/lib/plesk-9.0/postfix-sendmail-wrapper
    Access: (4755/-rwsr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)

    However, when trying to send mails from command line, we still get

    plesk sendmail[2120]: cannot create temporary file - (13) Permission denied

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