SMTP proxy for masking credit card numbers

[Joseph Sinclair]

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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