963 votesRobert Reiser commented
I am using mail extensions (the "+" syntax") extensively to protect myself against spammers and data leaks, and therefore would like to see this feature supported. As such, I would have to submit approx. 150 different email addresses to "Notify me" in order to keep me updated.
Perhaps a different, more simple approach could work? If someone queries a regular email address (e.g. email@example.com), just perform the query as usual, by searching for an exact match. If someone queries an address in the format "firstname.lastname@example.org", could you do a regex search against the database(s)?
With this approach, it might be easier for both the affected users and the site operators to achieve something acceptable for both sides. Thanks for consideration.