Unable to receive email from particular external sender

  • Thread starter H. Hudson
  • Start date Views 1,271
H

H. Hudson

#1
We have a Win2003SBS server, it's been working fine and no recent changes to

it. We have a customer from an external domain (Also a Win2003SBS) that

receives a NDR about 70% of the time when he tries to send email to a valid

email address on our domain. But we are able to send email to the user

getting the NDR.

You do not have permission to send to this recipient. For assistance,

contact your system administrator.

<theirserver.com #5.7.1 smtp;550 5.7.1 Unable to relay for user@ourserver.com
We are also running Brightmail Message Filter 6, but their domain is

whitelisted and it shouldn't be a problem.

The SMTP logs have stuff like this in them, but nothing around the time they

try to send email.

2009-08-25 16:51:01 Their IP Address OutboundConnectionResponse ACTIONSERVER

" 25

2009-08-25 16:51:01 Their IP Address OutboundConnectionCommand ACTIONSERVER

" 25

Any ideas?
 
J

jamestechman

#2
Have them check their SMTP loges, it's possible they might be having

DNS related issues in which sometimes it may not be actually resolving

to your correct MX record.

James Chong (MVP)

MCITP | EA | EMA; MCSE | M+, S+

Security+, Project+, ITIL

On Aug 27, 1:08 pm, H. Hudson <HHud...
wrote:
> We have a Win2003SBS server, it’s been working fine and no recent changes to
> it.  We have a customer from an external domain (Also a Win2003SBS) that
> receives a NDR about 70% of the time when he tries to send email to a valid
> email address on our domain.  But we are able to send email to the user
> getting the NDR.

> You do not have permission to send to this recipient.  For assistance,
> contact your system administrator.

> <theirserver.com #5.7.1 smtp;550 5.7.1 Unable to relay for u...@ourserver..com
> We are also running Brightmail Message Filter 6, but their domain is
> whitelisted and it shouldn’t be a problem.

> The SMTP logs have stuff like this in them, but nothing around the time they
> try to send email.

> 2009-08-25 16:51:01 Their IP Address OutboundConnectionResponse ACTIONSERVER
> – 25
> 2009-08-25 16:51:01 Their IP Address OutboundConnectionCommand ACTIONSERVER
> – 25

> Any ideas?
 
R

Rich Matheisen [MVP]

#3
On Thu, 27 Aug 2009 10:08:03 -0700, H. Hudson

<HHudson> wrote:


> We have a Win2003SBS server, it’s been working fine and no recent changes to
> it. We have a customer from an external domain (Also a Win2003SBS) that
> receives a NDR about 70% of the time when he tries to send email to a valid
> email address on our domain. But we are able to send email to the user
> getting the NDR.

> You do not have permission to send to this recipient. For assistance,
> contact your system administrator.

> <theirserver.com #5.7.1 smtp;550 5.7.1 Unable to relay for user@ourserver.com
> We are also running Brightmail Message Filter 6, but their domain is
> whitelisted and it shouldn’t be a problem.

> The SMTP logs have stuff like this in them, but nothing around the time they
> try to send email.

> 2009-08-25 16:51:01 Their IP Address OutboundConnectionResponse ACTIONSERVER
> – 25
> 2009-08-25 16:51:01 Their IP Address OutboundConnectionCommand ACTIONSERVER
> – 25

> Any ideas?


Well, first, if you plan on getting anything useful from your SMTP

protocol logs you need to record more detail. :)

Second, you'd need them to check /their/ SMTP logs to see what IP

address it is they're connected to (or what IP address it is thats

connected to them) when they get (or send) that 550 status code. It

may be that whoever it is that's sending you the email isn't using a

MAPI/RPC client and they aren't permitted to use their server a a SMTP

relay. Or it could be that they're using their ISP as a SMTP relay and

there's a problem at the ISP. Or they have a DNS problem and they're

sending your email to the wrong host.

IOW, there are lot's of reasons why they might not be able to send you

email, but the problem probably isn't yours to resolve.

-
Rich Matheisen

 

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