Networks

Ask something
Question Locked

Communication between two email servers

0 helpful
4 replies

by bawer barak

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

Hi;
I have two domains one is ???A.COM and another is ???B.COM ( ???A.COM and ????B.COM) and for this purpose i have installed two email servers (Kerio mail server)in DMZ zone. I can send emails to any domain and can receive as well one both servers from any domain, the only problem is that i cannot receive emails from MY ???A.COM to ????B.COM.

192.0.0.4 = ???A.COM email server
192.0.0.8 = ????B.COM mail server

I don't know why 192.0.0.8 cannot receive email from 192.0.0.4. Both have kerio mail servers. Can anyone help me.

Thanks
Bawer

4 replies

by churdoo

I don't know Kerio, but I can say this. Kerio may use DNS and MX records to identify the mail exchangers for ???B.com.

If so, go onto server ???A.com and do some NSLOOKUP's or DIG or whatever your fav NS tool is, and see what it's resolving the MX records of ???B.com. Most likely it's the EXTERNAL IP of ???B.com. Make sure you can ping whatever IP ???B.com resolves to.

My suspicion is that your internal DMZ IP addy's 192.0.0.0 IP's are static NAT'd, and you can't IP to the external NAT'd IP. If this is the case, you'll have to add host file entries or some similar method to force the server ???A.com to resolve ???B.com to it's internal IP of 192.0.0.8

by kaushik_99

HI friend

For cm between 2 mail servers,1 thing is that SMTP protocol handle the cm bet. 2 mail servers
The name server of 192.0.0.4 is unable to find out the dns entry of 192.0.0.8.So it cant receive your mails form A domain. And check the configuration of incoming and oungoing mail protocols. k
Thanks
kaushik K.

This discussion is closed to new replies.