Hi,
I have some sites hosted on a centos server that are using either the php mail function or sendmail. I haven’t change anything in the server’s configuration except installing the virtualmin updates, when I was notified. I suspect one of these updates changes something to postfix, maybe, though I don’t have much knowledge of how this is working.
The problem is I don’t know where to start and what to change back/fix. If anyone has any ideas, please share them. Any advice is appreciated.
My php scripts are announcing me that the emails have been sent; but they aren’t.
For what it matters, I have virtualmin 3.83.gpl GPL, centos CentOS Linux 5.5 kernel 2.6.32.8, webmin 1.530, php 5.1.6-27.el5_5.3, apache 2.2.3.
If you have any idea about how to fix my issue, please remember that I’m not an expert and give all the details, a step-by-step for noobs 
Thank you!