Before adding the alias the email sent back to the forwarder was simply "mhcgfx1b9j+caf_@..." is not a group member.
So I added the alias of the same...
Once that was done there are NO return emails to the forwarder! Yet groups.io logs what I have below and does not distribute to the group.
Are you now saying that the alias be changed from "mhcgfx1b9j+caf_@..." to "mhcgfx1b9j+caf_=p7j3q9k5=groups.io@..." ???
This appears arcane, even unnatural.
But I will give it a try.
Can't anyone explain why all my gmail forwards to other groups.io groups done months and years ago do not behave like this and without aliases? Someone who wrote these interfaces should know what is going on!!!