[CentOS] sendmail refusing incoming connections from outside

Yeap,
 By default it's disabled.
You need to enable it.
 Look at this mail 
https://www.redhat.com/archives/redhat-list/2001-September/msg02420.html
 Regards,
Marc Picornell de Louvigny
 On 8/5/05, Dave <wintermutecx at gmail.com> wrote:

> On 8/5/05, Alexander Dalloz <ad+lists at uni-x.org> wrote:
> > Am Fr, den 05.08.2005 schrieb Sudev Barar um 13:23:
> >
> > > You will need to edit /etc/mail/sendmail.mc and regenerate a new 
> sendmail.cf <http://sendmail.cf>
> > > Edit and add a line similar to below for your network:
> > > DAEMON_OPTIONS(`Port=smtp,Addr=90.0.0.2 <http://90.0.0.2>, 
> Name=MTA')dnl
> >
> > This is wrong, just because it will prevent the MTA listening on
> > localhost, which is important.
> 
> Just commenting out that line works also
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