?> The problem we are having is that most Gmail users who apply to a
?> Yahoo group by sending an email are not seeing the? "Please confirm
?> your request" automatic replies from Yahoo Groups. Gmail marks them
?> all as spam -- and the spam folder in Gmail is hidden.

This can also be a problem with Groups.io's confirmation requests, to
+subscribe as well as the other email commands.

I've suggested on beta that Groups.io use modern authentication
techniques (similar to DMARC) to eliminate the need for a confirmation
in those cases where the From address of the email command can be
authenticated. But naught has come of it yet.

?> Our members are very reluctant to set up an additional account
?> anywhere ...

I don't know if you want to tell your members this, but successful use
of +subscribe (or Invite or Direct Add for that matter) includes the
automatic creation of an account for the member's subscribed address.

In effect is not possible to be subscribed to a Groups.io group without
a Groups.io account backing the subscription.

That said, the member doesn't need to be aware of that account or
interact with the web interface in any way.

If they don't then the account has no password and is used simply to
hold a Time Zone & date formatting settings and a default Display Name
that will be in common to all of their group subscriptions. Assuming
they ever subscribe to other groups. The Default User Settings panel in
the Default Sub Settings tab of your group's Settings page lets you
pre-set the Time and Date stuff on behalf of your new members (those who
haven't already joined another group or otherwise created a Groups.io
account for their subscribed address).

?> ... and we don't need the browser-based features of Groups.io
?> (chat, calendar, database, photos, files, wiki, donations) anyhow.

If a member ever wants to look onsite for older messages, or your group
does start using some members-only features, a benefit of the automatic
account is that they don't need to go through any Sign Up process for an
account - they've already got one. They don't have to set a password or
think about any account settings.

All they need to do is Log In, using either the "Email me a link to log
in" or social login methods.

Shal