This is an insecure solution that doesn&#x27;t scale, and only works because nobody uses it.<p>I don&#x27;t need to lock my door either, but that kind of security doesn&#x27;t scale.  I either use mailinator for throwaway email signups, or I have a spam gmail account.<p>But I&#x27;m not going to give out my main account+marker if I expect to want to be able to undo sharing my email in the future at some point that I try to follow an unsubscribe link and it doesn&#x27;t work, or because my email might get sold: that&#x27;s just downright silly.  You think the kind of people that would sell email lists wouldn&#x27;t run a regex to strip +spam markers from gmail accounts?<p>You literally have to apply a one-line regex to do that.  It&#x27;s security by obscurity.  Anyone working at google should understand that.