Mark Constable writes:
I have a weird new install where mail comes in okay but trying to send out just hangs with no real feedback as to why but just now an attempt to send to Gmail gave me a hint..."Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication. Please review https://support.google.com/mail/?p=ipv6_authentication_error for more information." So it seems that maybe courier-mta is trying to use ipv6 and seeing that I'm not sure how to deal set up ipv6 I would like to completely disable courier-mta (and imap for that matter) using ipv6 and default to ipv4. I've set courierd:ESMTP_PREFER_IPV6_MX=0 but what other settings might influence using ipv6 over ipv4?
The only way to turn off IPV6 completely is to compile from source --without- ipv6.
But this is treating the symptom, rather than the ailment. I think if you set up an SPF record, Google will be more receptive to your mail. Additionally, what Google does or does not do has no bearing on sending mail to anyone else, so if you're having problems with other mail destinations, you need to take a closer look at your networking.
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