451 4.3.111 Temporary server error. Please try again later MRH1

Occasional Visitor

Hello everybody, we have been using Switf Mailer for a while conected to a mailbox on O365 but since yesterday we are receiving the following error.

Expected response code 250 but got code "451", with message "451 4.3.111 Temporary server error. Please try again later MRH1."

I don´t know what 4.3.111 means... I looked on internet but no results.

We thought at first that our mailbox was with some errors but all appears to be OK ... so we don't know where start...

 

Has anyone had this error, and how to solve it?

Cheers!

 

 

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