Sending hotmail messages via Thunderbird

06. November 2013 · Write a comment · Categories: Hotmail, Outlook.com · Tags: , , ,
My computer has just stopped sending hotmail messages via Thunderbird. I have been to the THUNDERBIRD help topics and all of the server settings are exactly as they should be. The error message is as follows:

Alert - an error occurred sending mail: SMTP server error. The server responded. 5.5.4 Invalid Address contact you mail administrator for assistance.  

Firstly I have no idea how to contact my e mail administrator and secondly I have no idea how to sort the problem. Any advice needs to be simply put. I am not smart technically speaking. I am working on a mac, not sure if that matters?

Thanks

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