darcs repository web UI and hosting app. This is the main darcsden trunk, which also runs hub.darcs.net. (http://hub.darcs.net)

#182password reminder emails are sometimes rejected by gmail

A successful delivery:

Nov 15 15:55:47 hub postfix/smtp[24983]: 0F052E20AC: to=<USER@gmail.com>, relay=gmail-smtp-in.l.google.com[74.125.20.27]:25, delay=0.78, delays=0.04/0.01/0.15/0.58, dsn=2.0.0, status=sent (250 2.0.0 OK 1542297347 x9si26504538pgh.12 - gsmtp)

A failed one (this one used an IPv6 address):

Nov 15 15:19:46 hub postfix/smtp[24651]: 2CA72D20AC: to=<USER@gmail.com>, relay=gmail-smtp-in.l.google.com[2607:f8b0:400e:c07::1a]:25, delay=0.44, delays=0.03/0.01/0.15/0.26, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2607:f8b0:400e:c07::1a] said: 550-5.7.1 [2600:3c01::f03c:91ff:fe62:77de] Our system has detected that this 550-5.7.1 message does\
 not meet IPv6 sending guidelines regarding PTR records 550-5.7.1 and authentication. Please review 550-5.7.1  https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . i13si866088pgg.100 - gsmtp (in reply to end of DATA command))
  • It seems we need an IPv6 PTR (reverse DNS) record, for which I need to get an A (AAAA?) record added for hub.darcs.net's IPv6 address 2600:3c01::f03c:91ff:fe62:77de.

  • This seems to be resolved:

    $ bash -cx &#39;dig +short -tA hub.darcs.net; dig +short -x 173.255.254.113; dig +short -tAAAA hub.darcs.net; dig +short -x 2600:3c01::f03c:91ff:fe62:77de&#39;
    + dig +short -tA hub.darcs.net
    173.255.254.113
    + dig +short -x 173.255.254.113
    li280-113.members.linode.com.
    + dig +short -tAAAA hub.darcs.net
    2600:3c01::f03c:91ff:fe62:77de
    + dig +short -x 2600:3c01::f03c:91ff:fe62:77de

    so emails should no longer be dropped for this reason.

    I suppose they'll still be occasionally dropped for other reasons. There isn't a SPF record yet. And indeed https://www.mail-tester.com gives darcs hub's password reminder emails a low 4.3/10 score due to

    [SPF] hub.darcs.net does not allow your server 173.255.254.113 to use darcshub@hub.darcs.net   -1
    Your message is not signed with DKIM   -1
    We didn&#39;t find a mail server (MX Record) behind your domain name hub.darcs.net.   -3

    Leaving this open.

  • MPART_ALT_DIFF		HTML and text parts are different       -0.724
  • Correcting my mispaste above just for the record.

    $ bash -cx &#39;dig +short -tA hub.darcs.net; dig +short -x 173.255.254.113; dig +short -tAAAA hub.darcs.net; dig +short -x 2600:3c01::f03c:91ff:fe62:77de&#39;
    + dig +short -tA hub.darcs.net
    173.255.254.113
    + dig +short -x 173.255.254.113
    hub.darcs.net.
    + dig +short -tAAAA hub.darcs.net
    2600:3c01::f03c:91ff:fe62:77de
    + dig +short -x 2600:3c01::f03c:91ff:fe62:77de
    hub.darcs.net.