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SMTP ports 25 and 587 on same Exchange 2003 server

Posted on 2012-03-12
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How do you configure Exchange 2003 to send mail on ports 25 & 587?
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Question by:tim_brooks
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by:rowansmith
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You have to configure one or the other:

Port 587 is for users to send out emails on. Port 25 is for servers to relay messages to one another. That way ISPs can block outgoing SMTP on their networks but still allow users to send email to any mail server through port 587.

You would only use port 587 where your ISP supported this and you were sending ALL emails via that ISP port 587 enabled SMTP Server.  You would use port 25 in the event that your Exchange server is able to communicate directly with any mail server in the world.  eg, it does it's own DNS lookups and determines where to deliver the messages.
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by:tim_brooks
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My ISP supports sending on port 587. I've found numerous articles on changing port 25 to 587 on Exchange. I want to send on both ports 25 or 587 from the clients. I haven't found any articles on how to configure Exchange 2003 to use ports 25 and 587.
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rowansmith earned 500 total points
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You must choose one port or the other for sending.  You can not send on both ports.

If on the otherhand you want your Exchange Server to RECEIVE email on BOTH ports then this is a different question.

Each time your Exchange Server needs to deliver a message via SMTP to an external recipient it makes a connection to a third party server.  This connection is either to port 25 OR port 587 on the third party server.

Your Exchange Server does not use port 25 or port 587 to make OUTBOUND connections, port 25 and 587 are ONLY used for inbound connections, ie, users or other SMTP servers that need to connect to your Exchange server.
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by:tim_brooks
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I've requested that this question be deleted for the following reason:

Question resolved
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by:rowansmith
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Please do not delete the question if it has been resolved.  It's important that others understand what the answer is.

Please update with a new answer appropriately.  Additionally if it turns out that the original question was incorrect, then please award points for answering that question as it was asked.
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by:rowansmith
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Objection to deletion request.  If Question has been resolved then question should be updated with the answer and not deleted.  Alternatively if the question was not asked correctly then the answer appropriate to that question should be awarded points.
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