An interesting tidbit about gmail that I gleaned from a community--not sure if it works or not, but I'm saving it here for future reference:
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Say your gmail address is janet@gmail.com and you sign up for something at abc.com. You can sign up as janet+abc@gmail.com. Gmail doesn't recognize the + or anything after it or before the @. This means if they ever sell that e-mail address or spam it, you would see that the mail was sent to you as janet+abc@gmail.com and know that it was that particular site that spammed/sold your e-mail address. Also gmail doesn't recognize .s, so j.a.net@gmail.com is the same as j.....an.et@gmail.com... etc. This is helpful if you wanted to use your last name in your email and see more clearly (eg, janetsmith vs. janet.smith).
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Say your gmail address is janet@gmail.com and you sign up for something at abc.com. You can sign up as janet+abc@gmail.com. Gmail doesn't recognize the + or anything after it or before the @. This means if they ever sell that e-mail address or spam it, you would see that the mail was sent to you as janet+abc@gmail.com and know that it was that particular site that spammed/sold your e-mail address. Also gmail doesn't recognize .s, so j.a.net@gmail.com is the same as j.....an.et@gmail.com... etc. This is helpful if you wanted to use your last name in your email and see more clearly (eg, janetsmith vs. janet.smith).