Why is Apple silently blocking my email?

Question

A number of my emails recently were not delivered through Apple’s iCloud on my .me account.
I called their Support and after many hours on the phone, I found out that iCloud silently filters email messages that contain something that they deem "offending".  An email will appear to be sent on the sender's side, but is never delivered to anyone on the "To:" list. It is similarly blocked on the receiving end.  So, I would not know, unless I contacted the person on the “To:” list, that an email was not delivered. Apple Support would not tell me what their filter is, nor would they give me a list of messages that they have silently filtered.  I spent a great deal of time testing one of the “offending” emails, and determined that I cannot send an email to anyone that contains the following link:
http://legalcubatravel.com
Who knows what other non-offensive “offending” links or text causes them to silently block messages!
I can however send it through my Yahoo email provider.
Can someone please explain how I can find out what emails have been blocked, and what type of filter is on the account?

Answer 1

This is happening to me, though not because it has any offending content. 
Apple has been silently blocking share trade confirmation note emails from by stock broker e-trade for about 12 months.  Thought it was a problem on their end, but when I switched to gmail, the messages flow through just finde.
And to make matters worse, I can't enen raise a support request with apple to get this resolved.  They wan't me to spend two hrs waiting on a telephone queue to the US (from Australia) to speak to someone.   
The contract note pdf's are password protected.  If wonder if this is the trigger for blocking?
Very dissapointing an frustrating.