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Please have a read of Demazter's article which walks you through exactly what you need to do:<br />
<br />
<a href="https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2857-Changing-the-default-port-of-an-Exchange-Server-Send-Connector.html" rel="ugc">https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2857-Changing-the-default-port-of-an-Exchange-Server-Send-Connector.html</a>
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@alanhardisty how would that solve the issue of his outbound email queue ? <br />
<br />
Other SMTP servers will still be expecting communication on port 25 so no matter what ports he change it to email won't pass thru 
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@Akhater - You can send out via whatever port you want - this has no bearing on the receiving port at the other end.
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@alanhardisty what you are changing is the destination port so the send connector will be using port, say 26, to communicate with the mail server of gmail.com instead of 25. the latter is not listening to 26<br />
<br />
unless you are talking about something different like setting your own smart host relay outthere on 26 or so 
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@viralrathod thanks for the sanity check
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@Akhater - so are you saying that if the Send Connector port is changed to port 26 (as an example), then that server can only communicate to server listening on port 26?
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@alanhardisty &nbsp;yes exactly since the destination port of the packet should match the listening port of the destination 
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Okay - that makes sense! &nbsp;Sorry - I'm tired.<br />
<br />
You can change the port - as long as you have a smart host on the other end listening on that port, so if Verizon can receive on port 587, then you can send them your mail to be delivered, otherwise switch ISPs to one that is not blocking port 25.
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Hi everyone, I must say that this blog is the best in the world. &nbsp;I am impressed with the response. I wanted to update everyone. Verizon FIOS is converting their system to accept outbound emails on &nbsp;outbound port from 25 to 587. &nbsp;They claim that they are getting a lot of spam on port 25. I followed instruction in this answer to change the send connector port to 587 and then verizon FIOS gave me a smtp server (outgoing.verizon.net) ,user name and password that I had to put in the send connector. Now it is workin. They did not notify anyone. They are converting from state to state. Their smtp server listens on port 587. Thank you very much for your help. Its great.
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Sorry for the confusing posts - it's been a long week.<br />
<br />
Glad you are sorted and mail is flowing.<br />
<br />
Alan
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yes what counts is that it is working for you now :)<br />
<br />
cheers
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YES...... I have to say it again that all of you are great help. I learned how to change send connector port. That was very important. I hate monopolies. Verizon can do what ever they want. Sucks. Sorry to close this on a negative remark. I wish I could give everyone 500 points. Have a great weekend. 
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So my comment stands true, they are blocking Port 25 from their connections, but allowing you to relay out via their authenicated SMTP Server?
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Yes - your comment stands true - the extra part needed was the article on how to change the default port from 25 to 587.
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Assuming you have all that you need - please don't forget to close down the question accepting the best answer(s) that assisted you with solving your problem.<br />
<br />
Alan
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Thank you for your help and sorry for the delay.
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<div class="content wysiwyg-content">
Hi , I &nbsp;have a major issue. &nbsp;Verizon FIOS decided to block port 25 in my area for commercial account. I an m running SBS2008 with exchange 2007. Is there anyway to change the smtp server port from 25 to 587. My email is queue is full of outbound email.<br />
<br />
Thank you in advance for your help
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Hi , I  have a major issue.  Verizon FIOS decided to block port 25 in my area for commercial account. I an m running SBS2008 with exchange 2007. Is there anyway to change the smtp server port from 25 to 587. My email is queue is full of outbound email.

Thank you in advance for your help

Change smtp port in exchange 2007

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.