[CentOS] smtp mailer or SMART_HOST in sendmail.mc

> In this case the change is so minor I would just get them to edit 
> sendmail.cf directly and add the appropriate smart host (Yes I know people 
> will shoot me for making this recommendation).
>
> For those unfamiliar with it you just edit  the DS Parameter eg
>
> # "Smart" relay host (may be null)
> DSsmtp.example.com

The obvious downside here is that if you ever rebuild your sendmail.cf
file from the mc file in the future, this change will be overwritten.

Ray