メールアドレス変更時に内部サーバーエラーが発生

[Canapin (Coin-coin le Canapin)]

@Richie

(The plus sign may be the significant key here, or it may be a red herring)

Enabling e-mail normalization by default

Background In the past, Discourse has shipped with e-mail normalization off. As a result of this, users can create multiple accounts using the same canonical e-mail, through the use of plus addressing. For example, a user with an account tied to bob@discourse.org is able to create another account tied to bob+again@discourse.org. Discourse comes with the normalize_emails site setting which can be flipped to either allow or disallow this. When turned on, it considers both e-mails above to be the …

Did you check the normalize_emails settings? Not saying there’s not a bug here