nicknames - What is another name for Dick?

Coming from "Changes in English names of people" telling:

Richard → Dick

Can I substitute Dick by Richard?
I need it to know because my Emails with the use of name Dick are being returned by Email filtering as obscene

Or what is substitute for name Dick?

I already asked it before but my question was deleted

Update:
Why is Dick Cheney, former Vice President of the USA, is always written/addresses everywhere in a tone of familiarity?
How can I call/address him without a tone of familiarity by a synonymous name?

So, I should address Dick Cheney as Richard Cheney instead?
Have I understood correctly the answers?