[CentOS] Sendmail is considered deprecated

Sat Apr 1 16:50:19 UTC 2017
Mark Milhollan <mlm at pixelgate.net>

On Fri, 31 Mar 2017, Xinhuan Zheng wrote:

>Today I searched redhat official portal and learned that Sendmail is 
>considered deprecated. By default, CentOS 7 will use postfix as MTA. I 
>need good advise on what it means to us. 

As of today you don't need to do anything, apart from explicitly 
installing Sendmail after any fresh install (either in the installer or 
any time after), e.g., yum install sendmail && yum remove postfix.

But deprecated suggests it will eventually be made unavailable so it 
would be wise to begin planning to transition to an alternative, though 
when that will happen is unkown so there's no timetable you can work 
towards.  Since Postfix is the only other MTA they provide that's what 
you should consider most strongly, though if you'd like alternatives 
EPEL provides at least Exim and OpenSMTPD.