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I have currently setup Postfix mail server for my company, but there is a bit of problem, the users I have defined for mail server MUST have shell access to server otherwise Postfix won't recognise it when he/she is trying to login which could not be true; I don't want my employees to have shell access to the server.

Questions:

  1. How can I define a mail user without giving it a permission to access server's shell?
  2. Is there any web-GUI for this kind of stuff(manage mail servers users) that I am not aware of?

PS. I am currently using postfix 2.11.0 and ubuntu server 14.04LTS

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I can't test it at the moment however, I believe nologin will work for you.

sudo usermod -s /usr/sbin/nologin username

It will only affect the users shell access, by instead of setting a default shell it will politely tell them to go away.

Additionally, postfix.admin may be the tool you're looking for to manage your users with a web interface.

http://postfixadmin.sourceforge.net/

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