The same goes for the plus variation, of course, though I'd hope that people would understand why you're asking them to send emails in this format. Should you want to be less open about these rules, like when you communicate with friends or clients, you can just give out your email address with a different variation of dots sprinkled into it, like or Just keep in mind that some wise guys may know that they don't need to add dots and could omit them altogether, so this filtering method is more prone to error.