creating users with mail but no system login

Bob livingsky at
Tue Jul 26 18:41:42 UTC 2016

I want to create users who only have email privileges on my system. I am 
using postfix but not virtual mailboxes. I have people I would like to 
supply a mail address for under a common domain, but they don't need any 
other access to my system. We are in different cities and provinces, so 
I would also need to provide some kind of mail relay for them. I know I 
can do 'adduser --system --disabled login' but that seems like it would 
block mail login as well. How would I do this?

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