Unbelievable: major Internet provider @UPC blacklisted by spamhaus. Customers can't send.pic.twitter.com/1JhbAt9Nmf
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@Edwin_vanVliet @ad_lagendijk Agreed. This is not abnormal behavior. Being an inconvenience: no doubt.
@bartblaze @Edwin_vanVliet Apparently Microsoft uses it and other lists to block @UPC for all its @Office365 users.
@ad_lagendijk @bartblaze @UPC @Office365 Then MS maybe misunderstood. But was the mail sent via a UPC SMTP server or directly from a UPC IP?
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