I’m not sure , you may refer this discussion, https://serverfault.com/questions/779730/why-dont-my-domains-messages-to-a-google-group-get-their-headers-rewritten-so
On Sat, Nov 23, 2019, at 7:23 PM, Jaroslaw Rafa wrote: > Dnia 23.11.2019 o godz. 19:10:51 Wesley Peng pisze: > > > > if you have used a mail.ru email for google groups, when you posted > > message to group, it will replace From header with the list address. > > Does it re-sign the message then? Because replacing the From: header would > break DKIM, as this header is always signed... > -- > Regards, > Jaroslaw Rafa > r...@rafa.eu.org > -- > "In a million years, when kids go to school, they're gonna know: once there > was a Hushpuppy, and she lived with her daddy in the Bathtub." >
