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I'm just starting with my own Virtual Server (and Linux). I've an apache2 and a few WordPress sites. I need to send mails via PHP (contact forms). I managed to install ssmtp with the help of a few tutorials. It sends mail with an gmail account. I'm not sure about the right permissions of the ssmtp.conf:

When I chmod 600 /etc/ssmtp/ssmtp.conf I cant't send mails from the commandline, php-contact forms are also not working.

When I chmod 640 /etc/ssmtp/ssmtp.conf I can send mails from the commandline, but php-contact forms are not working.

When I chmod 666 /etc/ssmtp/ssmtp.conf I can't send mails from the commandline and php-contact forms are working fine.

Obviously I would like to stay with 666, but I'm not sure if this could be a security problem.

  • have you tried 644 ? (allow anyone to read) – Archemar Oct 22 '14 at 14:13
  • gksudo gedit /etc/ssmtp/ssmtp.conf – Elba Yass Mar 17 '17 at 19:53
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It appears that you have your Gmail password in the configuration file so you would want the the third number to be 0 (No permissions to Others). Ideal is 640. You can change the ownership of the configuration file (using the command chown) e.g. chown root:mail /etc/ssmtp/ssmtp.conf.

You can send from the command line using sudo or as root. Your web server user also need to be a member of group mail. Or you can change that to root:www-data if the user group of the web server is www-data.

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    It's working fine with 640 after changing the ownership to root:www-data. Thank's for your help! – Albrecht Oct 23 '14 at 12:44

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