Solved

SMTP error

Posted on 2008-10-01
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Last Modified: 2013-11-30
I am getting two errors with my smtp on many e-mails.  The error is SMTP 4.4.7 and

PFCC-SERVER.PFCC.com #5.5.0 smtp;521-75.148.135.29 blocked by ldap:ou=rblmx,dc=att,dc=net

Does anyone know how to solve this issue.

Jason
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Question by:iFrog
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17 Comments
 
LVL 11

Assisted Solution

by:Bertling
Bertling earned 500 total points
ID: 22620007
your server IP address is on the AT&T spam list. go here to remove it: http://worldnet.att.net/general-info/mail_info/block_admin.html
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LVL 11

Assisted Solution

by:Bertling
Bertling earned 500 total points
ID: 22620070
also it seems your reverse dns and the server name in the FQDN on the SMTp virtual server is in correct.

please visit here and enter your domain name http://www.mxtoolbox.com/

then diagnose the mx records for issues with RDNS and spam etc.

this is why there is a good chance you are unable to send to some domains.
0
 

Author Comment

by:iFrog
ID: 22629209
Well i tried to fix this by using postinis outgoing server and I have now gotten myself into more trouble.  What do I need to do to have RDNS work correctly?
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LVL 11

Assisted Solution

by:Bertling
Bertling earned 500 total points
ID: 22629277
this will be a good read for you: http://www.amset.info/exchange/dnsconfig.asp
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Author Comment

by:iFrog
ID: 22638958
Yes, I read that and I think i still do not fully understand.

I downloaded the best practices tool and fixed most of my errors.  I seem to still get an open relay error though and I read many papers on this telling me to only approve users in my relay yet I still get that the open relay test failed.

I am not recieving mail just fine, but I am not sending mail at all.  I am constanly getting NDR errors in my event log.  With event ID 3030 or 3018.  I have taken my server off of the smart host.  Mainly because I am suddenly getting alot of spammers sending off the server.  This is a problem that occured after the Relay sytem was altered for the smart host.  I though doing a smart host would fix all of this.  The funny thing is that the mxtoolbox seems to be working fine for me.  I set the PTR record to point directly to my server.  

What am I setting up wrong?
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LVL 11

Expert Comment

by:Bertling
ID: 22639918
so you are an open releay?
what was the outcome when you tried to test your RDNS and if you where an open relay at mxtoolbox?
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Author Comment

by:iFrog
ID: 22642086
Well  I thought I closed off the relay and said only user on my network could connect.  However my queque shows 3500 messages.  Most have extermely odd ipaddresses.  Not sure what is going on there. I thought the relay is closed.

MXtoolbox comes back saying OK, however it is going to postini.  Not my actual server.
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Author Comment

by:iFrog
ID: 22642283
is there any tool i can use to see if my server was under attack, or what I have left open to vulnerability?
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LVL 11

Accepted Solution

by:
Bertling earned 500 total points
ID: 22644102
is you exchange server exposed to the internet? is there a external NAT rule or port forwarding to the exchange server?

postini should be the only SMTP server facing the internet or listening on port 25 from the internet.

your exchange server should only be permitting connections from the postini server only.

have you gone through this article? http://www.amset.info/exchange/spam-cleanup.asp

go ahead and clean up your smtp queues
0
 

Author Comment

by:iFrog
ID: 22645268
The exchange server sits behind a firewall.  

I undid the postini changes since as soon has I had set them up, the server started going haywire with SMTP requests.  I can't get rid of people trying to send out messages through the server.  I tried the spam cleanup document and everything checks out as if nothing is under attack, accept my Hard drive has quickly been decreasing in size.  I have 14,000 messages waiting to be sent that will not seem to delete from the queue.  

I am a bit confussed as to why the queues will not clean up
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LVL 11

Expert Comment

by:Bertling
ID: 22645342
have you scanned the server for viruses?
0
 

Author Comment

by:iFrog
ID: 22645638
I finally got everything cleared off.  

Yes we use trendmicro and we are coming back clean for viruses.  I did find some Spyware.

The Hard drive issue seems to be undercontrol too now.

Now that is all cleared up, now I got to figure out a way to get e-mail out.  We still can't seem to send e-mail out correctly.

Should I try to setup Postini again?  Or is there another meathod I should use?
0
 
LVL 11

Expert Comment

by:Bertling
ID: 22647572
is the exchange server sending and receving mail direct from the internet now? nd not using postini?
0
 

Author Comment

by:iFrog
ID: 22655039
Well I have incoming mail going through postini.  I just can not send out.  I know I need to do some fix some setting.  Just not sure what.
0
 
LVL 11

Expert Comment

by:Bertling
ID: 22655327
check your smtp connector with the * in the address space tab.
can you advise where this is pointing to? is it configured to send through postini as a smart host using the IP address?
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LVL 11

Expert Comment

by:Bertling
ID: 22661743
all ok now?
0
 

Author Comment

by:iFrog
ID: 22669748
Yes.  Once the fake senders were blocked from using the server and messages were cleared.  I set up under SMTP connections to only allow connections to postini servers.  Then instead of using the virtual host I started using Postini DNS.  So I set up delivery with a different DNS address.  Mail seems to be flowing good now.  I had a couple of kick backs but nothing I am worrying about yet.  Thanks for your help.
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