Web Security Project - identify possible database leaks

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I may have a solution to your problem. Do you have a support web, where your clients from the mailing list can log in? If so, you should send an email that they need to log in there and "submit new security policy" (just made it up). You can give them time limit for a few days or a week. The users who do not submit it in specified period would be removed from mailing list automatically. That should do the trick. I don't think that checking access through IP would be good solution (attackers could use proxies etc.)

Hello sir, I am a Web Developer and also a cyber security expert. There may be you system vulnerable for some kind of attacks. I can check all the possible ways with very low cost. I hope you will contact me. Thanks..