Originally Posted by
Hendrik Prins The OS build is 10.0.14393.67. I was wondering if it had anything to do with "block & filter" application? The other interesting thing is that when I forward the email with the attachments that will not open in my Lumia 950 back to myself, they can be opened fine on the same phone! Very strange to say the least. Thanks for your interest in this matter.
block and filter is for the sms and phone calls functionality, i doubt it would affect the mail app.
I can suggest you try downloading adobe reader for windows mobile, see if that triggers something.
Another question, did this start recently? Or has this always been the case?