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05.09.2008 at 05:57AM PDT, ID: 23389087 | Points: 500
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Unexpected connection response from server
Zones: SendMail Email Server, Anti-Spam Email Software, Email Servers
I am getting an undeliverable message when seding email to certain domains that reads "Delivery failed after 20 attempts.  Unexpected connection response from server".  I am behind a Barracuda spam filter but that should just be checking inbound emails and all the mail server information seems to be set up correctly since I don't have a problem with all the emails, just a select few.  Any help would be greatly appreciated!
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Question Stats
Zone: Software
Question Asked By: apl_helpdesk
Question Asked On: 05.09.2008
Participating Experts: 1
Points: 500
Views: 0
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05.09.2008 at 06:15AM PDT, ID: 21532421
_jesper_:

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05.09.2008 at 06:49AM PDT, ID: 21532736
apl_helpdesk:

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05.09.2008 at 06:51AM PDT, ID: 21532759
apl_helpdesk:

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05.09.2008 at 07:26AM PDT, ID: 21533147
_jesper_:

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05.09.2008 at 08:24AM PDT, ID: 21533809
apl_helpdesk:

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05.09.2008 at 09:12AM PDT, ID: 21534297
_jesper_:

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05.09.2008 at 09:17AM PDT, ID: 21534340
_jesper_:

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05.09.2008 at 12:40PM PDT, ID: 21535866
apl_helpdesk:

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05.09.2008 at 12:47PM PDT, ID: 21535909
apl_helpdesk:

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05.09.2008 at 12:52PM PDT, ID: 21535943
_jesper_:

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05.09.2008 at 01:05PM PDT, ID: 21536035
apl_helpdesk:

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05.09.2008 at 01:08PM PDT, ID: 21536057
_jesper_:

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05.09.2008 at 01:23PM PDT, ID: 21536175
apl_helpdesk:

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05.09.2008 at 01:30PM PDT, ID: 21536221
_jesper_:

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05.09.2008 at 06:15AM PDT, ID: 21532421
_jesper_:
Can you provide a sample header from one of the emails and log data from that transaction?
 
05.09.2008 at 06:49AM PDT, ID: 21532736
apl_helpdesk:
I've attached the header and the log.
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Header:
 
Date:     Thu,  8 May 2008 18:27:40 -0400
Message-Id: <10805081827.AA09713@andrewpeller.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
From:     "Postmaster" <postmaster@andrewpeller.com>
Sender:   <postmaster@andrewpeller.com>
To:       <victor.kolodziejski@andrewpeller.com>
Subject: Undeliverable Mail
X-Mailer: <SMTP32 v8.21>
X-RCPT-TO: <victor.kolodziejski@andrewpeller.com>
Status: U
X-UIDL: 495155614
X-IMail-ThreadID: 7e5c000004141978
 
LOG:
 
05:08 09:17 SMTPD(fd69016f0000264f) [192.168.10.23] connect 192.168.11.88 port 1900
05:08 09:17 SMTPD(fd69016f0000264f) [192.168.11.88] EHLO VICTORKPC
05:08 09:17 SMTPD(fd69016f0000264f) [192.168.11.88] MAIL FROM: <helpdesk@andrewpeller.com>
05:08 09:17 SMTPD(fd69016f0000264f) [192.168.11.88] RCPT TO: <anita@meltzermedia.com>
05:08 09:17 SMTPD(fd69016f0000264f) [192.168.11.88] C:\Program Files\Ipswitch\Collaboration Suite\IMail\spool\Dfd69016f0000264f.SMD 3626
05:08 09:17 SMTPD(fd69016f0000264f) performing antispam checks
05:08 09:17 SMTP-(fd69016f0000264f) processing C:\Program Files\Ipswitch\Collaboration Suite\IMail\spool\Qfd69016f0000264f.SMD
05:08 09:17 SMTP-(fd69016f0000264f) Trying meltzermedia.com (0)
05:08 09:17 SMTP-(fd69016f0000264f) Connect meltzermedia.com [208.118.72.70:25] (1)
05:08 09:17 SMTP-(fd69016f0000264f) 
05:08 09:17 SMTP-(fd69016f0000264f) SMTP_DELIV_FAILED
05:08 09:17 SMTP-(fd69016f0000264f) >QUIT
05:08 09:17 SMTP-(fd69016f0000264f) 
05:08 09:17 SMTP-(fd69016f0000264f) requeuing C:\Program Files\Ipswitch\Collaboration Suite\IMail\spool\Qfd69016f0000264f.SMD R0 T1
05:08 09:17 SMTP-(fd69016f0000264f) finished C:\Program Files\Ipswitch\Collaboration Suite\IMail\spool\Qfd69016f0000264f.SMD status=3
Open in New Window
 
05.09.2008 at 06:51AM PDT, ID: 21532759
apl_helpdesk:
sorry, here is the correct header.
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Date:     Thu,  8 May 2008 18:27:40 -0400
Message-Id: <10805081827.AA09807@andrewpeller.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
From:     "Postmaster" <postmaster@andrewpeller.com>
Sender:   <postmaster@andrewpeller.com>
To:       <helpdesk@andrewpeller.com>
Subject: Undeliverable Mail
X-Mailer: <SMTP32 v8.21>
X-RCPT-TO: <helpdesk@andrewpeller.com>
Status: U
X-UIDL: 495155615
X-IMail-ThreadID: 7e5c0000041819b7
Open in New Window
 
05.09.2008 at 07:26AM PDT, ID: 21533147
_jesper_:
Hmmm.  Can you also post the body of the undeliverable?  Is it any more explanatory?

You might want to telnet to the the domain SMTP port in question and issue the commands manually to see if the response from the server is the same.
 
05.09.2008 at 08:24AM PDT, ID: 21533809
apl_helpdesk:
The body of the undeliverable has no other usefull information.

What manual commands should I use??
 
05.09.2008 at 09:12AM PDT, ID: 21534297
_jesper_:
I'll get that for you but in the meantime, go to :

http://www.mxtoolbox.com/blacklists.aspx

put your sending server IP address in and let's make sure that you aren't blacklisted.
 
05.09.2008 at 09:17AM PDT, ID: 21534340
_jesper_:
Some notes:
1) after the ehlo, you will get a response about valid connection info from the other mail server
2) the word "data" below is exact -- not a free form field
3) the phrase "testing outbound mail" is free form.  put any text that you want here.  when you finish your message, a "." on a line by itself tells the MTA that the message is complete.
4) let me know the results of this test and the results of the RBL check.


telnet 208.118.72.70 25
ehlo andrewpeller.com

mail from: <helpdesk@andrewpeller.com>
rcpt to: <anita@meltzermedia.com>
data
testing outbound mail
.
quit

 
05.09.2008 at 12:40PM PDT, ID: 21535866
apl_helpdesk:
I checked the Blacklist and everything came back clean except for these 4 timed out but i don't believe it's a problem.

INFORMATIONWAVE  TIMEOUT   0 0
NJABLDYNA  TIMEOUT   0 0
REDHAWK  TIMEOUT   0 0
SOLID  TIMEOUT   0
 
05.09.2008 at 12:47PM PDT, ID: 21535909
apl_helpdesk:
I couldn't establish a connection to 208.11.72.70 please see below:

H:\>telnet 208.118.72.70 25
Connecting To 208.118.72.70...Could not open connection to the host, on port 25:
 Connect failed

H:\>telnet 208.118.72.70
Connecting To 208.118.72.70...Could not open connection to the host, on port 23:
 Connect failed
 
05.09.2008 at 12:52PM PDT, ID: 21535943
_jesper_:
It's port 25 (not port 23) and it works for me.

Test with other locations (telnet IP.OF.MAIL.SERVER 25).  If it works, then:

1) the remote end is blocking your IP address space
2) your own end is blocking that outbound SMTP connection.
 
05.09.2008 at 01:05PM PDT, ID: 21536035
apl_helpdesk:
It looks like the telnet test doesn't work (possibly because of my firewall?) because every mail server I test gives me the same message even though we don't have a problem sending emails to those domains.  Is there anything else I can test???
 
05.09.2008 at 01:08PM PDT, ID: 21536057
_jesper_:
Are you testing it from the mail server that is would normally perform the outbound connection?  This is where the testing needs to be done.
 
05.09.2008 at 01:23PM PDT, ID: 21536175
apl_helpdesk:
Sorry, my mistake.  When I run the telnet command on the mail server with a known good mail server it works however when I try using the 208.118.72.70 IP address nothing happens - the screen goes blank.  So does this mean the remote end is blocking my connection?  And if so, why?
 
05.09.2008 at 01:30PM PDT, ID: 21536221
_jesper_:
From an analytical perspective, it could be your end or their end.  

If you check with your network people and it's not your end, you would need to call the other end and ask why you are being blocked.

Bear in mind that the server admin group may not be blocking your IP(s).  It may be on their network side.
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628