Apologies for the delayed response, things don't usually run like this around here.
Read me.
See the first line of the error message? The SMTP server you are using for mail is not authorized to send mail for the address(es) you have set in General Settings. Either ask the sysadmin to allow relaying for your hotmail address, or use an address in General Settings that the SMTP server is authorized to relay from.
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Charles Capps,
Moderator, Post-Install TroubleshootingPLEASE NOTE: Due to time limitations, I do not provide UBB support via email.