SMTP Smart Host No longer connects!

[Guest Joel]

In the past, without particularly understanding how it works I've had fairly

good luck setting up an smtp service on a win2k3 machine so that some

applications we use could successfully send out emails for notifications.

I've always defined a smart host on the default smtp site properties.

 

Well, it seems that in one location the email notifications stopped working

a few months ago. And now I'm trying to figure out how to get it working

again and why it stopped working in the first place. In order to do this I

need to first figure out where the problem is and on whose network the

problem actually is. Our server is located on our customer's site and the

smart host (email server) is located at our site but is in the hands of the

networking group. I'm sure that someone has inadvertantly closed off Port

25 somewhere.

 

How can I narrow this down? Are there any simple tests I might perform to

try to figure out where the problem is and on whose network it is? In a

command prompt I've tried doing a 'telnet smartHostDomainName.com 25' but it

isn't giving me much of a clue because it doesn't connect. Thanks for any

help. /Joel

[Guest Jabez Gan [MVP]]

Re: SMTP Smart Host No longer connects!

 

If telnet smartHostDomainName.com 25 doesn't connect, then the problem is

that port 25 is either blocked or smtp service is not running. Send a guy

over to your customer's place and check...?

 

--

Jabez Gan

Microsoft MVP: Windows Server - File Storage

"Joel" <jwolfe(removethis)@digimarc.com> wrote in message

news:O3cbnRbQIHA.1208@TK2MSFTNGP05.phx.gbl...

> In the past, without particularly understanding how it works I've had

> fairly good luck setting up an smtp service on a win2k3 machine so that

> some applications we use could successfully send out emails for

> notifications. I've always defined a smart host on the default smtp site

> properties.

>

> Well, it seems that in one location the email notifications stopped

> working a few months ago. And now I'm trying to figure out how to get it

> working again and why it stopped working in the first place. In order to

> do this I need to first figure out where the problem is and on whose

> network the problem actually is. Our server is located on our customer's

> site and the smart host (email server) is located at our site but is in

> the hands of the networking group. I'm sure that someone has

> inadvertantly closed off Port 25 somewhere.

>

> How can I narrow this down? Are there any simple tests I might perform to

> try to figure out where the problem is and on whose network it is? In a

> command prompt I've tried doing a 'telnet smartHostDomainName.com 25' but

> it isn't giving me much of a clue because it doesn't connect. Thanks for

> any help. /Joel

>

[Guest Joel]

Re: SMTP Smart Host No longer connects!

 

Thanks for the reply! Ok, I am certain that the smtp service is running, so

I'm guessing that port 25 is blocked. But is there a way to determine on

which end this port is blocked? Is it blocked on the source network or is

it blocked on the target network? /joel

"Jabez Gan [MVP]" <mingteikg@blizNOSPAMhosting.com> wrote in message

news:352EDC8B-5EF2-46F6-9762-9DFEF8D33500@microsoft.com...

> If telnet smartHostDomainName.com 25 doesn't connect, then the problem is

> that port 25 is either blocked or smtp service is not running. Send a guy

> over to your customer's place and check...?

>

> --

> Jabez Gan

> Microsoft MVP: Windows Server - File Storage

> "Joel" <jwolfe(removethis)@digimarc.com> wrote in message

> news:O3cbnRbQIHA.1208@TK2MSFTNGP05.phx.gbl...

>> In the past, without particularly understanding how it works I've had

>> fairly good luck setting up an smtp service on a win2k3 machine so that

>> some applications we use could successfully send out emails for

>> notifications. I've always defined a smart host on the default smtp site

>> properties.

>>

>> Well, it seems that in one location the email notifications stopped

>> working a few months ago. And now I'm trying to figure out how to get it

>> working again and why it stopped working in the first place. In order to

>> do this I need to first figure out where the problem is and on whose

>> network the problem actually is. Our server is located on our

>> customer's site and the smart host (email server) is located at our site

>> but is in the hands of the networking group. I'm sure that someone has

>> inadvertantly closed off Port 25 somewhere.

>>

>> How can I narrow this down? Are there any simple tests I might perform

>> to try to figure out where the problem is and on whose network it is? In

>> a command prompt I've tried doing a 'telnet smartHostDomainName.com 25'

>> but it isn't giving me much of a clue because it doesn't connect. Thanks

>> for any help. /Joel

>>

>

[Guest Jabez Gan [MVP]]

Re: SMTP Smart Host No longer connects!

 

Try telnet-ing in your own network. If it works, try getting an employee to

telnet to the server on their network using their own intranet.

 

--

Jabez Gan

Microsoft MVP: Windows Server - File Storage

"Joel" <jwolfe(removethis)@digimarc.com> wrote in message

news:%23m5wJPlQIHA.1184@TK2MSFTNGP04.phx.gbl...

> Thanks for the reply! Ok, I am certain that the smtp service is running,

> so I'm guessing that port 25 is blocked. But is there a way to determine

> on which end this port is blocked? Is it blocked on the source network or

> is it blocked on the target network? /joel

> "Jabez Gan [MVP]" <mingteikg@blizNOSPAMhosting.com> wrote in message

> news:352EDC8B-5EF2-46F6-9762-9DFEF8D33500@microsoft.com...

>> If telnet smartHostDomainName.com 25 doesn't connect, then the problem is

>> that port 25 is either blocked or smtp service is not running. Send a guy

>> over to your customer's place and check...?

>>

>> --

>> Jabez Gan

>> Microsoft MVP: Windows Server - File Storage

>> "Joel" <jwolfe(removethis)@digimarc.com> wrote in message

>> news:O3cbnRbQIHA.1208@TK2MSFTNGP05.phx.gbl...

>>> In the past, without particularly understanding how it works I've had

>>> fairly good luck setting up an smtp service on a win2k3 machine so that

>>> some applications we use could successfully send out emails for

>>> notifications. I've always defined a smart host on the default smtp site

>>> properties.

>>>

>>> Well, it seems that in one location the email notifications stopped

>>> working a few months ago. And now I'm trying to figure out how to get

>>> it working again and why it stopped working in the first place. In

>>> order to do this I need to first figure out where the problem is and on

>>> whose network the problem actually is. Our server is located on our

>>> customer's site and the smart host (email server) is located at our site

>>> but is in the hands of the networking group. I'm sure that someone has

>>> inadvertantly closed off Port 25 somewhere.

>>>

>>> How can I narrow this down? Are there any simple tests I might perform

>>> to try to figure out where the problem is and on whose network it is?

>>> In a command prompt I've tried doing a 'telnet smartHostDomainName.com

>>> 25' but it isn't giving me much of a clue because it doesn't connect.

>>> Thanks for any help. /Joel

>>>

>>

>

>