It seems that many Exchange administrators decide to block emails with .zip file attachments. This it the digital equivalent of throwing the baby out with the bathwater.
I’ve wondered if this is an Exchange admin thing.
It’s the easiest thing to do since a lot of viruses come in through zip files. But zip is the most common compression format, so sending files to people gets complicated when a whole organization blocks the most common file format.
Admins can say to their users that they can use something like Mail Big File, or rename the extension, but I think it hurts your professionalism a bit when you have to explain “Oh, by the way, rename the file from file.notazip to file.zip and you’ll see the presentation I’ve prepared.” Not to mention the other person’s email server that could go “WAIT a second! .NOTAZIP is NOT a common extension!”