File Hashing Programs

Here are some you can try Command line options with recursion from the Amazing Nirsoft www.nirsoft.net/utils/hash_my_files.html
Digital Volcano is famous for their Duplicate Cleaner. They also have a free hash tool. Includes some stellar options like drag and drop as well as ‘Hash from list’. www.digitalvolcano.co.uk/hash.html
CyoHash This is a nice little tool that gets added to your right click menu in Windows github.com/calzakk/CyoHash sourceforge.net/projects/cyohash/files/latest/download

Test your email reputation

When you send an email, there are oodles of things that get checked to score your email. If you score badly, your email may get blocked or land in the spam/junk folder.
You can test it using mail-tester www.mail-tester.com/
They give you a random, temporary address. Send an email there and then check the score.