Question

SMTP 554 Client host rejected

Asked by: f3tpadmin

Hello all,

I am encountering an email issue with one of our employees.  It is when he sends an email to a company (lets call it xyz)  He has tried multiple contacts in the company (we know they are accurate).  However the emails bounce back immediately with the following error.

Any thoughts?  I had our ISP change our pointer record so a reverse lookup is now the correct dns entry...

Your message did not reach some or all of the intended recipients.
 
      Subject:	Our Employee - New contact information
      Sent:	9/3/2009 1:19 PM
 
The following recipient(s) cannot be reached:
 
      first.lastname@companyxyz.com on 9/3/2009 1:19 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mail.mycompany.com #5.5.0 smtp;554 <75-144-198-237-Connecticut.hfc.comcastbusiness.net[75.144.198.237]>: Client host rejected: Use your providers mailgateway 20060811>

                                  
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Asked On
2009-09-03 at 10:54:56ID24705442
Tags

exchange 2003 smtp dns

Topics

Domain Name Service (DNS)

,

Exchange Email Server

,

Simple Mail Transfer Protocol (SMTP)

Participating Experts
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Answers

 

by: alanhardistyPosted on 2009-09-03 at 10:59:08ID: 25253153

I would try setting up an SMTP connector for this domain to send out via your ISP's smarthost (call them for the IP Address) and then test sednign again.

This is what they are asking you to do - so worth a try.

http://technet.microsoft.com/en-us/library/aa996625(EXCHG.65).aspx

Check your domain on www.mxtoolbox.com/diagnostic.aspx to see if other errors are present on your domain / configuration.

 

by: f3tpadminPosted on 2009-09-03 at 11:15:38ID: 25253311

I went to mxtoolbox.com and this is what i got.

Looks good on our end.  I even checked the blacklists and we look good...

 Not an open relay.
 0 seconds - Good on Connection time
 0.359 seconds - Good on Transaction time
 OK - 75.144.198.235 resolves to mail.f3partners.com
 OK - Reverse DNS matches SMTP Banner

                                              
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by: alanhardistyPosted on 2009-09-03 at 11:20:05ID: 25253365

This part of DNS Report from www.dnsstuff.com may highlight a problem:

WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

f3partners.com.s9b2.psmtp.com claims to be invalid hostname 'Postini': <br />   220 Postini ESMTP 208 y6_20_1c2 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements. <br />f3partners.com.s9b1.psmtp.com claims to be invalid hostname 'Postini': <br />   220 Postini ESMTP 207 y6_20_1c2 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements. <br />f3partners.com.s9a2.psmtp.com claims to be invalid hostname 'Postini': <br />   220 Postini ESMTP 228 y6_20_1c2 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements. <br />f3partners.com.s9a1.psmtp.com claims to be invalid hostname 'Postini': <br />   220 Postini ESMTP 160 y6_20_1c2 ready. CA Business and Professions Code Section 17538.45 forbids use of this system for unsolicited electronic mail advertisements. <br />

 

by: MesthaPosted on 2009-09-03 at 11:36:30ID: 25253554

If someone is using Postini, the tools on dnsstuff.com are useless for confirming behaviour on outbound email, because they cannot test for that.

Note that the error above is for 75.144.198.237, whereas you have posted in a second message that you tested 75.144.198.235.

I do an nslookup on 75.144.198.235 I get the result you are expecting.

Therefore if your email is supposed to be going out on 235 then you need to check your NAT.

Simon.

 

by: f3tpadminPosted on 2009-09-03 at 11:39:40ID: 25253588

We do use postini for inbound email.  I will check on our outbound connection on the router as i did catch that .237 issue and wasnt sure why there server would be looking at that..

 

by: f3tpadminPosted on 2009-09-03 at 12:17:21ID: 31624571

Ok so it appears that .237 is what our outgoing traffic goes outbound through... so i take it this is some spam prevention measure as it sees mail.f3partners.com as .235 and is confused.  so changed it to now go through .235 and like magic it appears to be working now.

20120131-EE-VQP-002

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