Hi Yaisel,

On Tue, 21 May 2019 at 01:42:12AM -0400, Yaisel Cruz Zuñiga wrote:
when sending an email to [email protected] he tells me this (error with recipient '[email protected]')
[...]
when I send an email to a user on the same server everything is perfect

it looks like your webmail.ucf.edu.cu isn't allowed to relay.

Depending on your Exchange version, please have a look at EMC -> Server Configuration -> Hub Transport. There you can define a receive connector. While running this wizard you can define an IP address (the one of your webmail.ucf.edu.cu) which is allowed for anonymous relaying. You can find several how-to's how to do this (also via Power Shell). After configuring this connector correctly sending mails from webmail.ucf.edu.cu to external recipients should work.

HTH and regards,
Markus

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