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6.3 POP before SMTP

Does your ISP use POP-before-SMTP authentication? This authentication method simply requires you to contact the POP server before sending email. To do that, put the following lines in your ~/.gnus.el file:

(add-hook 'message-send-mail-hook 'mail-source-touch-pop)

The mail-source-touch-pop function does POP authentication according to the value of mail-sources without fetching mails, just before sending a mail. See Mail Sources.

If you have two or more POP mail servers set in mail-sources, you may want to specify one of them to mail-source-primary-source as the POP mail server to be used for the POP-before-SMTP authentication. If it is your primary POP mail server (i.e., you are fetching mails mainly from that server), you can set it permanently as follows:

(setq mail-source-primary-source
      '(pop :server "pop3.mail.server"
            :password "secret"))

Otherwise, bind it dynamically only when performing the POP-before-SMTP authentication as follows:

(add-hook 'message-send-mail-hook
          (lambda ()
            (let ((mail-source-primary-source
                   '(pop :server "pop3.mail.server"
                         :password "secret")))