I have been using Google groups for quite some time. Recently, when I'm viewing the mails from these groups I get warnings on the header saying:
This message may not have been sent by firstname.lastname@example.org
I'm mostly using the groups for discussions, so I don't really care. I just don't want anyone to get that warning when I send a message to the group. How do I go about that?
What should I do so that whenever I send an email to any of the groups, another user of this group doesn't get this warning?