troubleshooting Question

Exchange email out on port 587

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eddiewickensFlag for Afghanistan asked on
ExchangeSBSEmail Protocols
2 Comments2 Solutions859 ViewsLast Modified:
I have various independent exchange servers  (various versions) at numerous sites with internet connections with numerous ISPs.
One ISP blocks all port 25 traffic. they are saying to send out on port 587.
I am trying to send out directly rather than relaying via their smtp servers

If I do this surely various emails will not be accepted by those only receiving on port 25.

Or am I missing a trick?
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