One might ask how a virtual postcard can give someone a sexually transmitted disease. Nevertheless, are these emails sent anonymously? If so, who would take such an email seriously? Are there any safeguards to prevent pranksters? I have ex’s that would abuse such a system.

I feel the best Approach to notifying a partner that s/he may have been exposed to a STD is to tell him/her personally, either by phone call or vis-à-vis. Heck, here in Michigan the Health Department will notify your partner on your behalf. Emails can be ignored or accidentally deleted. Notifying a partner in person or by human proxy guarantees that your partner has been informed.