HELP PLEASE: Undelivered Mail Returned to Sender?

[mattevansnz]

Hi Everyone,

I have a small issue.

I have a client with an email list (xxx@xxxx.com.au) which when sent an email to, will forward the email on to ten users.
All emails are sent apart from 2 of them, which have different domain extensions. (xxx@xxx.id.au).

The bounce email I am getting back is...

<xxx@xxxx.id.au> (expanded from <xxx@xxx.com.au>): host
mail2.mail.com said: xxx.xxx.xx.xx Client host rejected:
cannot
find your reverse hostname, [xxx.xxx.xxx.xx] (in reply to RCPT TO
command)

Can anyone shed any light on this problem?
Your help is much appreciated.

Matt.

 

[tlcscousin]

It usually points to the sending server not having a reverse DNS lookup registered. Lots of places are using filters which check for a reverse DNS record and if none exist reject emails from the server sending the email.
You would need to have the DNS adjusted for the mail server to have a vlid reverse lookup setup.

http://en.wikipedia.org/wiki/Reverse_DNS_lookup

 

[mattevansnz]

Thanks tlcscousin!
Your help is appreciated.

Matt.

 

[58sniper]

Yep. A *LOT* of systems will block if the rDNS doesn't exist or is wrong. Have your provider create one, and it's best if it's the same as the MX record (mail.domain.com)...

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.

http://www.ucblogs.net/blogs/exchange/