[tor-bugs] #29770 [Internal Services/Service - lists]: mails relayed to gmail.com bounce back

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#29770: mails relayed to gmail.com bounce back
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     Reporter:  anarcat                            |      Owner:  tpa
         Type:  defect                             |     Status:  assigned
     Priority:  Medium                             |  Milestone:
    Component:  Internal Services/Service - lists  |    Version:
     Severity:  Normal                             |   Keywords:
Actual Points:                                     |  Parent ID:
       Points:                                     |   Reviewer:
      Sponsor:                                     |
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 It seems we're having trouble relaying mails to gmail.com and possibly
 other providers.

 A similar question was raised by a tor-announce@ participant in `Message-
 ID: <CAHQQdjtuVj68EVw_TsnDGiTRj1bY7iyxuehUDj6bya=KAqE0MQ at mail.gmail.com>`

 I myself had trouble sending mail to a @tpo account that is forwarded to
 gmail (bounce is `Message-ID:
 <20190311210933.9AB57E1B16 at eugeni.torproject.org>`):

 {{{
 <target at gmail.com>: host gmail-smtp-in.l.google.com[64.233.167.26] said:
     550-5.7.1 This message does not have authentication information or
 fails to
     pass 550-5.7.1 authentication checks. To best protect our users from
 spam,
     the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
     https://support.google.com/mail/answer/81126#authentication for more
 550
     5.7.1 information. f2si4120705wrj.403 - gsmtp (in reply to end of DATA
     command)
 }}}

 I suspect this might have to do with (lack of) SPF records and/or ARC
 headers.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29770>
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