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There was a SMTP communication problem with the recipient's email srvr

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There was a SMTP communication problem with the recipie... - 14.Sep.2009 4:32:01 AM

kumail

Posts: 44
Joined: 8.Mar.2006
Status: offline

hello

I need help please

everybody at the company i am working at having a problem sending email from Exchange to hotmail.

if a user wants to send an email it rejects and sends the following error msg:

Your message did not reach some or all of the intended recipients.

Subject: mooon
Sent: 9/14/2009 11:20 AM

The following recipient(s) cannot be reached:

*****. on 9/14/2009 11:22 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<****** #5.5.0 smtp;550 SC-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support>

how do I solve this problem ??

thanks in advance for any help

< Message edited by kumail -- 14.Sep.2009 4:41:23 AM >

Post #: 1

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RE: There was a SMTP communication problem with the rec... - 14.Sep.2009 6:06:19 AM

jveldh

Posts: 2335
Joined: 12.Apr.2008
From: The Netherlands
Status: offline

Hi,

Please make sure:

- you have a ptr record which is pointing to the correct A-record
- your IP list is not blacklisted

_____________________________

Best regards,

Johan Veldhuis

Visit my Exchange blog

(in reply to kumail)

Post #: 2

RE: There was a SMTP communication problem with the rec... - 14.Sep.2009 6:17:54 AM

kumail

Posts: 44
Joined: 8.Mar.2006
Status: offline

thanks for your prompt response.

forgive me for my silly questions but I am newbee :)

What is ptr record and A-record ? and how do I check if the ptr record is pointing to the correct A-record ?

and how do I know if my IP list is not blacklisted ??

(in reply to jveldh)

Post #: 3

RE: There was a SMTP communication problem with the rec... - 14.Sep.2009 10:44:52 AM

uemurad

Posts: 8232
Joined: 7.Jan.2004
From: California, USA
Status: offline

PTR and A records are types of DNS entries.

An A-record associates a Fully Qualified Domain Name (FQDN) to an IP address. For Email, it needs to be a publicly routable address (not a private address).

An MX-record associates a priority value (0-255) with a FQDN which must be defined by an A-record.

A PTR-record is used for reverse-lookups, associating an IP address with a FQDN.

The difference between A and PTR records is how they are queried. When your system asks the public DNS systems to tell you the IP address of a FQDN, the A-record is consulted. When your system asks the public DNS systems to tell you the FQDN of an IP address, the PTR-record is consulted.

Hotmail (and other Email hosts) try to filter out spam by executing a reverse DNS lookup for the IP address from which mail is coming. If you have no PTR record, the query will come back null, and your message will be rejected. Similarly, if the domain in the FQDN returned does not match the domain in the sending address (yourname@yourdomain.com), it can also be rejected or tagged as spam.

_____________________________

Regards,

Dean T. Uemura
Microsoft MVP - Exchange (2007-2011)
exchangeguy.blogspot.com
uemurad@yahoo.com

(in reply to kumail)

Post #: 4

RE: There was a SMTP communication problem with the rec... - 15.Sep.2009 4:06:10 AM