value="fa7b5ec1877d6fe404cbfc4168d24767"> Knick-Knack
Wed: Apr 09, 2014

Google, your IPv6-related email restrictions suck. Amen, I recently got bit by this with a new Linode instance (they assign IPv6 to their servers, which is great until you run into this.) There seems to be an easy fix with Postfix: Fixing Google's new IPv6 mail policy with Postfix and for Sendmail I had to add a line from here: How to stop Sendmail sending mail from IPv6 instead of IPv4.

e.g. if your IPv4 address is 1.2.3.4, specify:
CLIENT_OPTIONS(`Family=inet6,Addr=::ffff:1.2.3.4')dnl

It's especially frustrating because I do have a reverse PTR record, it was required to be able to send to Comcast. While Comcast seems ok with it Google just flat refuses mail no matter what I do.


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