In the last 2 weeks, I started getting two problems: firstly, I had numerous emails rejected with the following error codes:

Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550-(blu0-omc3-s4.blu0.hotmail.com) [65.55.116.79]:34872 is currently not
550 permitted to relay through this server.

Then, I have found that some of my inbound mails were not reaching me - ie: people where sending the mail to a wide group with myself included, and it was only when someone else replied to all that I got the mail.

Any possible solutions and /or help welcome

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