email censorship

Icloud decided to refuse to send a pdf that I had created without any error message or any acknowledgement that the entire email hadn't been sent.

After a frustrating hour deleting text line by line from the pdf I had created I find that the text "http://www.cafedeladanse.com" (a perfectly respectable music venue) is causing this problem. When this line is deleted the email & pdf will be sent.

a. Is this Apple censoring my (perfectly legitimate) content.

b. If indeed this is the case, why can I not have some kind of notice that this is happening, so I don't spend business hours trying to find the cause o the problem.