Search WWW Search

Sunday, August 20, 2006

Exchange: NDR 571 - MAIL REFUSED - Reverse DNS failed; cannot resolve the domain in the HELO command


You receive the following NDR when sending to a third party domain:

Your message has encountered delivery problems
to the following recipient(s):
Delivery failed
571 - MAIL REFUSED - Reverse DNS failed; cannot resolve the ( domain in the HELO command.

You verify that your domain does indeed have a Reverse DNS Record.


The third party domain is performing HELO lookups, also known as forward DNS lookup. When initiating a SMTP session with a third party domain, the domain validates your domain name by performing a forward check, Domain to IP rather than IP to Domain in reverse DNS lookups. If you designed your DNS namespace for Active Directory and chose a namespace different than your public domain name ie. company.local, your Exchange server by default will advertise as HELO I'm The third party domain will attempt to lookup company.local in DNS and will fail and thus reject your E-Mail.


1. Open Exchagne System Manager. Navigate to Administrative Groups, Site, Servers, Servername, Protocols, SMTP, Default SMTP Virtual Server,

2. Highlight Default SMTP Virtual Server, right click properties.

3. Go to the Delivery Tab, and click Advanced Button.

4. In the "Fully-qualified domain name: field, enter your fully qualified external domain name. Click Check DNS to verify that it resolves.

5. Restart SMTP service.

James Chong
MCSE M+, S+, MCTS, Security+

How useful was this article? Want to see a tip not listed? Please leave a comment.


Anonymous Anonymous said...

Excellent - exactly what I needed. Thanks!

5:51 AM  
Anonymous Gerard (from Amsterdam) said...

Thanks, saved me a lot of searching!

6:30 AM  
Anonymous MSvojsik, Praha, Czech republic said...

Cool work James, thank You.

6:54 AM  
Anonymous Anonymous said...

excellent, good job. tank you

2:52 AM  
Anonymous Anonymous said...

excelente, muchas gracias


excelent, very thanks

4:24 PM  
Anonymous Steve said...

Yes!! You da' Man!

1:34 PM  
Anonymous Anonymous said...

good job. thank you.

2:41 AM  
Anonymous Anonymous said...

Is there a resoluton for an exchange server running 2007? Procedure might be different? I have this issue with one domain and I tried to change the name to no avail, and most of the searches seem to be with Exchange 2003

1:23 PM  
Anonymous Anonymous said...

Thank you very much. It really helped.

9:30 AM  
Blogger longge said...

Polished golden brass metallic pieces greatly match with the gorgeous patent leather. Metal plate with the replica handbags signature on the flap is telling us that the exquisite purse is from replica bags . With the press stud closure, designer replica handbags is measured at 9.4" x 4.7" x 1.2". For a dinner or party, the size is just right. Moreover, it has inside space for six credit cards and a zippered pocket for small change or other accessories. With removable strap made of gold brass chain and patent leather, designer handbags can be hand-held or carried on the shoulder.

5:26 PM  
Blogger vishal said...

Easy Earning money in online never been this easy and transparent. You would find great tips on how to make that dream amount every Day. Sitting in the home earn around $100 per day. So go ahead and click here for more details and open floodgates to your online income. All the best.


2:54 AM  
Blogger Josu said...

Thanks for your help,

i have this problem but just with one Domain, mailing to other domains worked fine for 6 years. Should I make this test if i only have fails with an unique domain?


1:43 AM  
Blogger dong dong said...

christian louboutin
oakley sunglasses cheap
christian louboutin outlet
hollister clothing store
ray ban outlet
louis vuitton outlet stores
christian louboutin sale
michael kors bag
cheap lululemon
michael kors outlet online sale
true religion outlet
coco chanel
michael kors handbags
ray ban glasses
red christian louboutin
louis vuitton handbags
michael kors outlet online
coach outlet store online
rolex watches outlet
celine outlet
ray ban sunglasses
cheap jordans
coach factory outlet
jordan 13
hollister clothing
tory burch outlet online
oakley vault
jordan shoes
mont blanc
toms outlet
nfl jerseys

12:38 AM  
Blogger chenyingying9539 9539 said...

nike air max
jrodan retro
burberry outlet
chanel bags
true religion jeans
jordan 8s
oakley vault
dior handbags
gucci outlet
michael kors outlet
polo ralph lauren
toms outlet
louis vuitton outlet
cheap jordans
oakley sunglasses
hermes birkin bag
sac longchamp pas cher
michael kors outlet
mulberry handbags
chanel bags
louis vuitton outlet
coach outlet
coach factorty outlet
ray ban uk
hollister clothing store
hollister clothing store
louis vuitton handbags
ralph lauren outlet
michael kors

7:17 PM  

Post a Comment

<< Home

xml:lang="en" lang="en"> MS Exchange Tips: Exchange: NDR 571 - MAIL REFUSED - Reverse DNS failed; cannot resolve the domain in the HELO command