Re: Delivery delayed --> xxx@aol.com

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THK wrote: 
The potential for spoofing when providing a RDNS or RMX too great.
Is there another option?

.:tk:.


"Ulf Hettstedt" wrote:

There are mail servers who require a sending SMTP server to have an MX entry in the DNS record. This is a way to avoid SPAM-senders to connect from unlisted SMTP servers.

AFAIK this is against the relevant RFCs but I noticed this too, while we moved domains.

There are two ways to avoid this
1. add an MX entry for the SMTP-host
2. route the email via an "default"-SMTP host, which has an MX-entry (maybe from your internet-provider, where you have a login)


Hope this helps,
Ulf



"THK" <THK@xxxxxxxxxxxxxxxxxxxxxxxxx> schrieb im Newsbeitrag news:63213637-8424-43C0-8B71-14763BCA1884@xxxxxxxxxxxxxxxx 
Hello Everyone,

An odd thing is happening. When any of my users sends an email to anyone to
the AOL.COM domain (so xxx@xxxxxxx), they get the following message:

This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
xxx@xxxxxxx

This is a W2K3 server and every other email domain goes through OK.

Any advise?

Thanks.

.:tk:.






Afraid not; AOL's postmasters are very strict - we deal with this on an ongoing basis at my company.

You can test it by telnetting to one of AOL's mx's and starting an SMTP conversation - it'll let you know pretty quickly if you're on the BL.


--
Sincerely,
Daniel S. Tate,
MCSA+Messaging,
Sun Certified Security, Network and Systems Administrator
.