SMTP proxy for masking credit card numbers

[James Finstrom]

On Tue, Jan 25, 2011 at 6:57 PM, Joseph Sinclair
<plug-discussion at stcaz.net>wrote:

> This is a somewhat unusual requirement, so I couldn't find a quick
> out-of-the-box solution, but there is a way to do this.
> The general-purpose approach is to add a filter on the mail processing
> path.  There are many listed here (https://www.milter.org/) that work with
> sendmail, postfix, and similar common MTA's.
> You will probably need to write a regex matcher or a small python script
> (using pymilter http://pymilter.sf.net/) to match anything that looks like
> a credit card and replace the digits with 'x' or similar.
> Keep in mind this will probably be a bit "fuzzy", as there are many things
> that look enough like a credit card number to result in some mistaken
> filtering.
>
> Hunter Kreie wrote:
> > I'm looking for a lightweight, open-source STMP proxy that I can use to
> mask credit card numbers on inbound messages. This is content-manipulation
> or content-scrubbing vs. content-filtering. I'm sure this can be done with
> quite a few packages, but what's your recommendation?
> >
> >
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Regex: http://www.regular-expressions.info/creditcard.html

<http://www.regular-expressions.info/creditcard.html>
^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$.
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