On October 19, 2021, we have enabled single-sign-on for our Plesk Support Center to provide a seamless login/account experience. This implies that you’ll be able to use a single account across any of our web-facing properties.
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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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    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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    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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