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How to check if mail relay works without shutting down the server?

As the title said: I would like to know how can I check that a mail relay that have been configured for me at my ISP is working, without shutting down my exchange 2000 server?

Thanks.
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ereza
Asked:
ereza
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1 Solution
 
kevalaCommented:
Don't get the question.....you want to confirm that you are being used as a relay? Or want to confirm that you are not being used as a relay?
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Hyper8Commented:
Open a command prompt and fire off a telnet session.

telnet servername 25  <enter>

HELO  <enter>

MAIL FROM: externalAddress@hotmail.com <enter>
(This actually can be any ficticious address. As long as it is valid on your domain.)

RCPT TO: valid@externalAddress.com  <enter>
(This needs to go to a valid external address)

DATA  <enter>

Subject: Test  <enter> <enter>    (Hit <enter> twice)

Test message goes here  (Hit a . twice and hit <enter>)

You should receive a    250 OK

Type Quit to end the session.

PS. Don't try to use this for spoofing because it will have your name and server all over the header.

Hope this helps.
     Hyper8
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Hyper8Commented:
Correction:

MAIL FROM: externalAddress@hotmail.com <enter>
(This actually can be any ficticious address. As long as it is valid on your domain.)

Should be: As long as it IS NOT a valid address on your domain.
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atmearCommented:
(Hit a . twice and hit <enter>)

What exactly does this mean... it is not working for me...

Screens says... <CRLF>.<CRLF>

Hummm.....
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Hyper8Commented:
After you type Subject: test  hit <enter> twice.

(This is where I messed up. It's been awhile.)

Type your message then hit a period and enter.Then hit space, period, enter, period then enter.

If routing is not allowed you will receive a 550 error.
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atmearCommented:
(Hit a . twice and hit <enter>)

What exactly does this mean... it is not working for me...

Screens says... <CRLF>.<CRLF>

Hummm.....
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erezaAuthor Commented:
some more on the situation: I have an email server which blocked for relay to other servers. my ISP has another server that should be configured to relay for my server (so if my server is down, i will still get the email after bringing it up).
telnet is not an option as they block it or just remove the service.

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atmearCommented:
(Hit a . twice and hit <enter>)

What exactly does this mean... it is not working for me...

Screens says... <CRLF>.<CRLF>

Hummm.....
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atmearCommented:
sorry for double posting... not really sure how that happened...

Thank You for the additional information
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atmearCommented:
sorry for double posting... not really sure how that happened...

Thank You for the additional information
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ymashCommented:
Ereza, they can't block from telneting to the server or the server won't work, make sure you telnet to port 25.
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erezaAuthor Commented:
ymash, this is what i get when i try to telnet to that server: Could not open a connection to host on port
25 : Connect failed
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ymashCommented:
Hmm, but if you can't telnet to port 25, that means that neither can any other mail server and no mail can be delivered to this server! Unless I'm missing something, this server can't accept mail.
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Hyper8Commented:
They may be using SSL. If that is the case you should be able to at least telnet and make a connection to port 443.
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erezaAuthor Commented:
again, got the same error on port 443 (connect failed)
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ymashCommented:
is there a firewall between you and the mail server that might be blocking you?
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erezaAuthor Commented:
finally, it did work.
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