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I have a custom domain (I'll use the real domains cause I'm desperate at this point :) ) www.grantorino.io, and I want to forward all email addresses sent to yehiasalam@grantorino.io to yehia.asalam@gmail.com. I followed the logical steps but I can't seem to get it right. This is what I did so far:

1. Map the MX record to the grantorino server, a dig command shows that the mx have no problems, and that mail.grantorino.io maps correctly to my server.


2. Next step is allowing port 25 on the firewall settings, so it's now open to accept TCP connections from port 25


3. 
   

   Make Sendmail forward any mails from yehiasalam@grantorino.io to yehia.asalam@gmail.com. I started with allowing the virtuser feature, an excerpt from sendmail.mc

   
   
   

   FEATURE('virtusertable', 'hash -o /etc/mail/virtusertable.db')dnl

   
   


4. 
   

   The virtusertable I added

   
   
   

   yehiasalam@grantorino.io yehia.asalam@gmail.com

   
   

and compiled using makemap hasg virtusertable.db < virtusertable

5. Also in the access file I added

Connect:grantorino.io RELAY

and compiled using makemap hash access < access.db

6. 
   

   Finally in the sendmail.c I changed the DEAMON_OPTIONS line to

   
   
   

   DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp')dnl

   
   

The problem right now is that I'm not getting any emails forwarded. This is the tail of maillog, after a couple of minutes of sending an email to yehiasalam@grantorino.io. As you can see I'm not getting any activity at all.

The .io top level domain seems to tell me the entire grantorino.io domain does not exist in the public DNS:

$ dig grantorino.io SOA
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 17264
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; AUTHORITY SECTION:
io. 823 IN SOA a0.nic.io. noc.afilias-nst.info. 1497562067 10800 3600 2764800 900

$ dig grantorino.io MX
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24001
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; AUTHORITY SECTION:
io. 292 IN SOA a0.nic.io. noc.afilias-nst.info. 1497562067 10800 3600 2764800 900

Also, a reverse DNS query indicates there is no PTR record either, and that would cause your system to fail one of the oldest anti-spam tests:

$ dig -x 162.242.170.86
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58070
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; AUTHORITY SECTION:
170.242.162.in-addr.arpa. 300 IN SOA ns.rackspace.com. hostmaster.rackspace.com. 1543432701 3600 300 1814400 300

No wonder your domain cannot receive email: when viewed from the outside, it does not even seem to exist!