[webmin-l] Virtualmin Email Doesn't Work

[Kimberly <kim...@gm...>]

I have two different servers; one on a VPS, one on a dedicated server, 
both using CentOS 7 and Virutalmin and on both servers emails don't 
work.  This is a Virtualmin issue.  Both servers if I try to send an 
email to a user the emails just disappear.  They don't bounce back, they 
don't show up in the user's inbox, they just disappear.  Furthermore, 
the whole send email client configuration doesn't work; I even checked 
forwarding.  The email client configuration does not show up either on 
the server or the forward email.  Now on one server I can get 
thunderbird to connect and pull the mail settings and on the other it 
can't.  However, on the server that does, it keeps telling me that the 
password is wrong even when I added it manually in sight and copy and 
past into Thunderbird.  Is it the default settings in firewalld that 
Virtualmin creates?  I don't know.  What I do know is that I have two 
servers with Virtualmin where emails don't work and if emails don't 
work, then Virtualmin has to be discarded as valid options for control 
panels

Now on a third server that just has webmin; no virtualmin, I have emails 
working, they come in and show up in the user's inbox. That server I 
manually configured everything but it only has one real domain for the 
mail server.

If there is some magical tutorial on setting up Virtualmin to use 
multiple domains with one mail server to get it all working, please show 
me that because I haven't found it.