In June 2016 gmail is going to be changing its DMARC policy to reject any unaligned mail. This means that we will be seeing any mailing list responses from a gmail.com
address to be considered spam by any mail server that enforces DMARC.
For a while now yahoo.com
has had this policy turned on which has meant that yahoo.com
addresses have been considered spam.
The boost mailing list is currently on mailman 2.1.15. I'd strongly suggest that this should be updated as a matter of urgency else we'll find a lot of the conversations on this list will end up in the spam folder...