[CentOS] Confusion over sendmail and smtp auth on a 6.2

Gerald Braun gbraun at b-m.com
Fri Jan 27 17:33:53 UTC 2012

While certainly Centos 6.2 specific, I found the following How-tos very
helpful in setting up a similar Sendmail/Dovecot configuration on Centos.



Hope it helps.


> I'm reading a lot on how to setup my smtp auth on a new Centos 6.2 
> server. I want to use sendmail and have this running on a Centos 3 
> machine now, so it's not new stuff to me.
> Unfortunately, the more I read, the more confusion I seem to have. 
> Firstly, how to generate my certificates. A good recommendation or howto 
> would be in order. I think most of the confusion here comes from the 
> commented names of files used in sendmail.mc for all the auth files. As 
> far as I can tell, the encryption length is the only change I need 
> (going to a minimum of 2048 bits) from the old system generation. Those 
> "pem" files throw me a bit, though.
> Secondly, I'm reading DoveCot has a problem with security and that I 
> need to run something other than ? (Cyrus, Courier, etc) to make this 
> work. I typically don't run imap security, only on smtp, so I'm not sure 
> if there's to be interference between the two. Since postfix is the 
> default now on Centos 6.2, what should I look for by changing it back to 
> sendmail when it comes to smtp auth?
> I only authenticate users that are not in the building on our network to 
> allow them to send email. They're free to use pop or imap to retrieve 
> their email without authentication.
> Thanks for any clarity on this.
>steve campbell

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