Emails from exchange online not getting through

[cheryl+hunt]

A friend using an exhange online email domain hasn't been able to reach me since mid January. It was fine before then. He gets the message  'Your message couldn't be delivered. Despite repeated attempts to contact the recipient's email system it didn't respond.'.

[jayach]

Similar problems from various Microsoft domains have been reported on here.

As far as I know, no one has been able to explain it or suggest a "work-around".

[cheryl+hunt]

Thanks Jayach. any idea what i can do about it?

[jayach]

I'm afraid not.