ISP does not allow send mail on port 25

I have a customer that recently switched ISP and this ISP requires sending of e-mail using port 465 and username and password.  they are a reseller of verizon so I would imagine that configs for Verizon would work similarly.  What I was wondering is what do I need to do in Exchange 2003 to make it send e-mail through, say a smarthost or any way that it will send e-mail with this ISP.  I have configured a smarthost to forward mail to their mail server and also changed the port to the required 465.  But it just seems to go and sit in the queue without delivering.  After a time I would get a NDR as follows:  chrisk@abc.com on 6/29/2008 11:47 AM
  Could not deliver the message in the time limit specified. Please retry or contact your administrator.
  <xxxxxxx.net #4.4.7>

I have read a number of links and articles, some stating that this cannot be done with Exchange 2003.  I thought I would put it to the test.  It just seems to me like there should be a way.

P.S.  The ISP says that we are the first to do this with them, so they are very little help.
integranetworksAsked:
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dfxdeimosConnect With a Mentor Commented:
I think my first post is the answer you aren't looking for... sorry.
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dfxdeimosCommented:
Tell the ISP to quit acting like a little b!7$& and open up port 25. =P
The default for the entire world is 25. If you have your e-mail server sending out on an alternate port any place you send to would have to have that alternate port set up for listening on their e-mail server.
This isn't the word of god, but I think you are SOL.
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DrDave242Commented:
Does that customer have a business-level account with the ISP?  It's common for residential accounts to have restrictions on what ports can be used for outbound traffic (port 25 is restricted frequently as an anti-spam measure), but business accounts, which are a bit more expensive, do not usually have such restrictions.
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Hardeep_SalujaCommented:
Hi.. Follow like this >>>

Firstly,
Telnet <exchangeservername> 25
Are you able to send mail using telnet ??

Now,
Do>> telnet maila.microsoft.com 25
This will exactly tell you if port 25 is open
If it says, cannot connect ....
.... any firewall?? spam filtering?? Isp blocking port 25?? these could be reason
If gets a flag, u should be good on this end and there is something more to look into this

Please let me know..
Thanks
Hardeep Saluja
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dfxdeimosCommented:
We have already established that the ISP is blocking Port 25 Hardeep.
He is trying to determine if Exchange can send on an alternate port, that is where the conversation began.
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integranetworksAuthor Commented:
That is correct.   We have established that the ISP (Powercom) is blocking port 25.  THis is becoming more and more common with SBC, Verizon and their resellers.  We can set outlook to send through port 465 with a username and password and it works fine, but when I try and use a smarthost and send through Exchange 2003 all it does is sit out in the Queue.  Their ISP is very frusterating to work and I ended up having to prove to them that they were blocking the port in the first place.  And the fact that we are the first customer of theirs using Exchange 2003 this way blows my mind!

Anyhow.  Any assistance would be greatly appreciated.
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tropixCommented:
ever any fix for this?
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Hardeep_SalujaCommented:
Hiiii .. any update or any other information you require, please let me know
Hope above information helped :)
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integranetworksAuthor Commented:
I ended up working around through sending through an alternative connection through outlook.  Not the best, but it works.  Will look at switching them to a different ISP when they have the time and $$.
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