Originally Posted by
FellJunior
Not all emails are delivered; some end up in spam folders, some are eventually returned by the protocol for various reasons e.g. recipient mailbox is full, some simply disappear. BT, Yahoo, Google have increasingly stringent but apparently inconsistent rules for vetting messages with the result of far too many false positives, i.e. rejections, which are never delivered. Similarly, they apply rules to filter mail servers from which they will accept messages. BT's customer forum has page upon page of complaints about non-delivery. Many messages are excluded for no reason other than another domain on the same server was deemed to have once sent spam. A message can be dumped for having too many recipients, on the basis it implies spam. I spent most of March setting up a stand alone mail server for a club to circumvent such problems due to the number of our emails, which were never delivered.
So forget conspiracy theories, it's likely to be poorly implemented technology, out of the control of the FRA or you and me.