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smtp - can use any other port other than 25?

can smtp use any other port for outgoing mail? how does that get configured or checked?

thanks
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Chewe Chileshe
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how can we find what port is being used in relay server situation.

port 25 is for the exchange server or the client which uses the exchange server connection to send an email?
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>>then negotiate a high port for return communication.

why high port? 24 will work just fine, too, right? what is the reason for the 'high'
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thanks.