For a couple of days now I have been unable to send emails containing Box links to many of my contacts. Specifically this relates to @bbc.co.uk addresses. As soon as I include any Box link the emails bounce, if I send them without it seems fine.
The error messages include:
What is going on?
Has Box been black-listed? Have I been black-listed?
PS: I believe I have this problem with @hotmail.com & @outlook.com addresses too)
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