This is the error our client's exchange server comes back with. We have confirmed the Hotmail account works and it live.
Requested #550 Requested action not taken: mailbox unavailable ##
It appears MS are blocking our domain as telnet email fails (see below). The same telnet commands work when not using the client's network.
220 BAY0-MC4-F17.Bay0.hotmail.com Service ready
helo ahmrc.org.au
250 Requested mail action okay, completed
mail from:******@ahmrc.org.au
550 Requested action not taken: mailbox unavailable
Connection to host lost.
Is anyone able to assist? It appears MS are blocking our clients request to send email to Hotmail.com
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