Net::SMTPSyntaxError: 501 Invalid RCPT TO address provided
问题 As I understood I have issue because use not ASCII symbols in emails address Example: Notifier.rb mail(to: "Tamón ÄRUÄ <example@example.com>", subject: "Email subject") Any advice how I can handle this case? I prefer keep user name in address. 回答1: According to ActionMailer documentation multibyte encoding should be done automatically: http://guides.rubyonrails.org/action_mailer_basics.html#auto-encoding-header-values There might be several things to try: Try adding # encoding: utf-8 to the