What I do at work to avoid the email filters is to change the suffix to .bmp and send with instructions to rename it back. Sometimes, that's the only way to get code to vendors.
I have a server so that's no a big issue, but creating the link, asking people to use it, then downloading the file is less convenient than sending directly the file by email.
I have a server so that's no a big issue, but creating the link, asking people to use it, then downloading the file is less convenient than sending directly the file by email.