Notes
After signing up, the new email isn’t used to notify that the account always exists. Discourse didn’t used to behave this way, for example, before January 6th, this never happened on this site. There has been at least one site upgrade since then, and since that happened, this bug has been introduced.
This might be related to the HTTP/500 error we get on our Discourse when using + signs in email addresses depending on the status of the normalize_emails setting:
תודה על זה, אתה צודק, זה היה ההגדרה normalize_emails שהשתנתה במהלך השדרוג, והייתה באג כאשר normalize_emails מוגדר וכבר יש לך חשבונות דואר אלקטרוני המשתמשים בתווי +.
I think this setting is also the cause of the 500 fatal error our users are getting when trying to change their email address to one with a + sign in it.
Perhaps it should not be enabled if such accounts already exist.