RC-Crypt can be used to encrypt or decrypt data using the RC5 algorithm. It operates on 128-bit data blocks, adding random characters for padding if necessary. The key size can be chosen by the user, but 64 bits or greater is recommended. It has many input/output options, making this a versatile piece of software suitable for embedding into scripts.
The "From" address
I don't get a lot of spam, and bounce what I do get, but most of it is returned as "undeliverable".
Maybe I'm a bit naive, but is there a good reason why the mail services can't at least check for a valid From and/or Reply To address?
Helping people feel less stupid
Most people hate feeling stupid. If they've made a silly mistake they won't want to own up.
The first time they come to you with one of these is the most important. If you make fun of them or treat them as imeciles, they'll try to cover up even more the next time.
I try to remember sily mistakes I make so I can let them know they aren't the only ones who mess up.
That way they are more co-operative with responding to questions I ask the next time.
As always, relationships are key...