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? > > > ---- > > Fairytale Brownies & friends have raised $30,000 to build a playground with KaBOOM! Help us reach our goal of $72,000 by April 2011. > Make your donation and mark on behalf of "Fairytale Brownies Playground Project". Thanks for your support! > > ---- > > Hunter Kreie > Information Technology Team Leader > Fairytale Brownies > 4610 E. Cotton Center Blvd, Suite 100 > Phoenix, AZ 85040-8988 > > hunter@brownies.com > Direct: 602.489.5149 > Main: 602.489.5100 > Fax: 602.489.5133 > > Join us on: > blog.brownies.com > > [cid:image001.jpg@01CBBCA4.973EE110] [cid:image002.jpg@01CBBCA4.973EE110] [cid:image003.jpg@01CBBCA4.973EE110] > > > > ------------------------------------------------------------------------ > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change your mail settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss