Data validation

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Hi,

Can anyone point me to a means of performing some sort of data validation on input data at the server end?

Specifically, I want to store email addresses to be looked up by sendmail when doing alias processing. I want to have these aliases managed by users who may not be totally trustworthy, so I'd like to knock out any attempts to add aliases that have redirection or pipe operators in them.

The printable string schema syntax (OID=1.3.6.1.4.1.1466.115.121.1.44) is pretty close to what I need, but it doesn't include the '@' character.

Any ideas?

Thanks in advance, Bob.....