@gmail.com宛てのメールだけ届かなくなってたので調べてみた。 > ... while talking to gmail-smtp-in-v4v6.l.google.com.: > >>> DATA > <<< 550-5.7.1 [46.51.xxx.xxx] The IP you're using to send mail is not authorized to > <<< 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your > <<< 550-5.7.1 service provider instead. Learn more at > <<< 550 5.7.1 http://support.google.com/mail/bin/answer.py?answer=1