Make sure the issue isn't a vulnerability on your end. What I mean is your website's forum, CMS or DKP system. If it keeps happening to just your guild, consider checking into that. There are known issues with older versions of EQDKP and all the major forums / CMS systems have public and private exploits.
Make sure your guild knows not to use the same login information on ANY website that they use for their account. Make a new login, password for just forums and non trustworthy sites.
Internet 101.
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