Many years ago, Penn Jillette (of Penn & Teller) suggested a good way to sneak obscenities past Email filters: Let your dictionary correct the obscene words, and take whatever alternative word is suggested. Your mail won't be blocked, and your recipient will know exactly what you meant.
It is in this spirit that I never cease to be fascinated by spelling suggestions from word proecessors that are not exactly au courant. For example:
Pixies for pixels
Spa for Spam
Spasm for Spams
and gaol for aol.