Ubuntu relay email server through ISPs SMTP

Easy  way to set-up fast, simple  and reliable email relay server which will work with ISPs smtp server.

1. Install EXIM4  server: apt-get install exim4  exim4-config

2. run : dpkg-reconfigure exim4-config; choose following config:

             a: mail sent by smarthost; no local mail

             b: you domain name (example.com)

             c:  loopback address 

             d: nothing

             e: domain name (example.com)

             f: ISP's host name - smtp.comcast.net

            g: No

            h: Yes

3. Test, using php, perl or install mail utils: apt-get install mailutils :

           a. type: mail your@email.com

           b. cc:

           c: subject

           d: body

           e  type single period (.) to send