On 29/03/2016 2:53 a.m., surgemailHIDDEN@etwinsite.com wrote:
> surgemail-support <surgemailHIDDEN@t@netwinsite.com> wrote:
>
> I'm using surgemail installed on ubuntu under my company domain.  The MX records forward to mail.mydomain.com which points to the ubuntu server, my actual hosting of my website is on a webserver hosted by another company.
>
> If I want to have SSL on my mail.mydomain.com can I use Letsencrypt?

Yes.

>   would I have to install it on my ubuntu server which houses the surge mail  server?
Yes

>
> Also would I have to replicate this on my mirror?

You could get the ssl certificate for mail.xyz.com and mail2.xyz.com and 
then use the same on both, or you could get a second certificate for 
mail2.xyz.com

ChrisP.,