sendmail not able to send mails to outer domain

[oracletest]

okk

so u mean , i hav to hav DNS server,if i need to send mail to outer domain. I'll not be able to send mail to outer domain if i don hav DNS server.??

[Irithori]

From a DNS point of view,
a properly configured mailserver should have:
- a fixed, public IP
- a A record
- a MX record
- a PTR record
- propably SPF
SPF: Project Overview

If these basics are done, you can start configuring the mailserver itself.
Most important: make sure it is no open-relay.

[oracletest]

hey Irithori

Its done ..thanks a ton!!!
the issue was with port only...it is unblocked now...

May god belss you always....

[oracletest]

hey Kieren

thanks alot, the issue was with port only
Its working now

[oracletest]

Hi

my issue is resolved, but i have a query for my knowledge sake.If i configure a DNS server, do i need to register my domain formally to some site, or will it work on my system's dnsdomain?

[Irithori]

While registering a domain, you can choose to have your own DNS.
You need at least two.
They have to be public reachable, ie have public and static IP addresses.
As a consequence, you are then responsible for configutation, security and availability.

ie:
no DNS -> no mail
no DNS -> no.. nothing

[oracletest]

hi

I am still confused with the term 'registering the DNS'. Could you spread some more light on that..

[Lakshmipathi]

I found this very useful guide couple of years back : Quick HOWTO : Ch21 : Configuring Linux Mail Servers - Linux Home Networking