Email rejected from one account on server, but not another

[GoWilkes]

I'm having a rather confusing problem. I have several hosting accounts on my server, but I'm specifically going to refer to www.mydomain.com, www.primary-host.com, and www.secondary-host.com.

Let me apologize in advance if this post is confusing. I felt like I needed to give a lot of detail, though, because it's a confusing problem to have!

The problem is that when www.primary-host.com or www.secondary-host.com emails people on certain ISPs, they get a notice that the email was rejected, but when I email them through www.mydomain.com, it goes through just fine. Primary-host.com and secondary-host.com are owned by the same client, and are used on the same computers.

Primary-host.com has about 75 POP accounts created, and is on the same IP as Mydomain.com. Secondary-host.com only has 4 or 5 POP accounts, and is on the same server, but with a different IP. The client has an internal network that I was sure was causing the problem, but I tried logging in to their Webmail and sending a test email, and it still bounced! Now I'm completely at a loss.

I asked another client on the same IP to send a test email to one of the addresses that had bounced, and they had no errors reported, either.

All 3 accounts have the same SPF record:

mydomain.com. 14400 IN TXT "v=spf1 a mx ~all"
primary-host.com. 14400 IN TXT "v=spf1 a mx ~all"
secondary-host.com. 14400 IN TXT "v=spf1 a mx ~all"

The problem is currently occurring with bellsouth.net and sbcglobal.net; both owned by AT&T. I suspect that it will occur with all AT&T owned addresses, if not others. The error message from Bellsouth stated:

host gateway-f2.isp.att.net [XXX.XXX.11.16]: 550-XX.XX.XX.XXX blocked
by ldapu=rblmx,dc=bellsouth,dc=net
550 Error - Blocked for abuse.

And the error message from SBCGlobal.net stated:

host sbcmx6.prodigy.net [XXX.XXX.36.20]: 553 5.3.0 nlpi076,DNSBL:521< XX.XX.XX.XXX_is_blocked.__For_information_see_http://worldnet.att.net/general-info/bls_info/block_inquiry.html


Note that I typed the XX.XX.XX.XXX in place of the actual IP. In the recipients IP, the XXX.XXX is the same for both headers, but the last 2 sectors are different.

I've checked all of the blacklists, and this IP isn't listed. And as I said before, I could email the same recipients with mydomain.com with no problems.

I'm kind of at a loss on where to go from here! Any suggestions?

TIA,

Jason


PS, I did submit an unblock request yesterday, but since it doesn't appear to be the entire IP that's blocked, I don't think it will help.

 

[Serra]

Actually, I'm having the same exact problem. I'm trying to resolve it, but there doesn't seem to be anything wrong with my setup.

 

[GoWilkes]

Well, Serra, if no one else is reporting the problem, then somehow it's just me and you!

Are you only having problems with AT&T subsidiaries, like me, or with a different ISP?

 

[GoWilkes]

Nevermind, I see from your other thread that we're not alone.

http://forums.cpanel.net/showthread.php?t=83093

 

[devilsoulblack]

i have the same issues

Asunto: Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
SMTP error from remote mail server after MAIL FROM:<[email protected]>:
host sbcmx2.prodigy.net [207.115.20.21]: 553 5.3.0 flpi191 -
mBFEoRrc013851, DNSBL:521< 174.36.192.50
> >_is_blocked.__For_information_see_http://att.net/blocks

------ This is a copy of the message, including all the headers. ------