Secondary MX record?

[killmasta93]

HI,
Quick question, Currently we have 2 lSP service one has the PTR record which is mail.mydomain.com and on the mx record its mail.mydomain.com with priority 1 so my question is do i create another mx record on the domain which would be mail.mydomain.com but with priority 2 and point to the my second lSP IP?

Thank you

 

[Stoiko Ivanov]

create an A-record for mail2.mydomain.com -> 2nd ISPs IP address, add another MX record with priority 2 pointing to mail2.mydomain.com

I hope this helps!

 

[killmasta93]

Thanks for the reply, i guess i would also need to have a PTR record with my lSP mail2.mydomain.com? so lets say my lSP principal which is mail.mydomain.com goes down, i would internally change my email server to mail2.mydomain.com so also outbound emails go correctly with the PTR?
Thank you

 

[Stoiko Ivanov]

If possible that would be a good idea - outbound mailing works better with a correct reverse pointer (quite a few mailservers do not accept mail if the DNS setup is not correct)

 

[killmasta93]

Thanks for the reply, just our of curiosity howcome email servers dont have the correct PTR? such as google, godaddy, exchange, i know its a shared hosting but howcome they never get issue on email going to spam? is it because they are practically a monopoly? Such as my lSP they have thier email server using PTR record

corp-avas.une.net.co

which a lot of people use their email but of course it does not have the correct PTR but even though the email does not have any issue with SPAM.

 

[Stoiko Ivanov]

AFAIK most of the servers (google, ...) do have a correct setup - in the sense that:
* they have a reverse pointer for the ip pointing to host.name.com
* host.name.com resolves (maybe among other things) to the ip
* they use host.name.com in their HELO/EHLO command

 

[killmasta93]

Thank you for the reply, so even if someone sends and email using gsuite with another domain woulnt it have issue with the reverse PTR?

 

[Stoiko Ivanov]

no - because the google servers have a correct forward and reverse pointer - which are aligned with the EHLO hostname

all 3 (forward, reverse pointer, helo name) don't need to have anything to do with the domain for which mail is sent

 

[killmasta93]

so lets say i host an email server with 2 email domains, how would i have the correct forward and reverse pointer? if one is mail.domain.com and mail.domain2.com? both using the same IP?

 

[Stoiko Ivanov]

Pick anyone of the two names - and add that name as MX-record to both domains

 

[killmasta93]

Thanks for the reply, will give it a go and post back