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Received from Peter Rupprecht at 6/18/2018 07:33 PM UTC:

Hello, Shal and anyone who knows,

We just transferred in a large group and one of our members has indicated
a concern with receiving group posts. As he put it:

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(Begin quote)

There is a significant difference in how the new host sends out group messages.
Namely, the new host sends them " From: " each individual SBL member rather than
" From: <mailto:[email protected]>[email protected]."
By consequence, the messages get blocked by the spam filter.
Whitelisting <mailto:[email protected]>[email protected] does not help because the messages are not sent
by <mailto:[email protected]>SBL<mailto:[email protected]>@Groups.io. They are sent " From: " 1,500 individual accounts.

Before the changeover, the mails were From: <group <mailto:name@...>name@...>
Now, the mails are From: Individual name <mailto:persons-email@...><persons-email@...>, or whomever.
Anyone with a rigorous filter — which some of us need — is not t currently receiving any messages.

(End quote)

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I'm not sure how to help. No one else has yet indicated a problem with this.

Thank you,

Peter

Your subscriber's approach to filtering spam is overly aggressive and has likely been causing him issues here and there for quite some time. I suggest he contact the ISP that offers this filter, or if it's something he purchased separately, contact customer support.

But in an effort to be more helpful than judgmental...

On the white listing side of things... there are headers that consistently contain "groups.io" or "[email protected]." He needs to white list mail containing "groups.io" in one of those headers. The "Sender:" header containing [email protected]" seems like a good candidate.

Or on the rejection side of things can he include a second criterion in each rule that blocks messages from groups.io saying something like "Any Header doesn't contain groups.io"

There's one more solution... he can get a new email address that's used for NOTHING but groups.io (and maybe other mailing list) subscriptions. Presumably that email address won't have been propagated to every spammer in the universe and will be essentially spam-free.

I have some email addresses that are 25 years old that get no spam because I use them only with friends and the rest of the world (where the spammers live) has never seen them. ;-)

Good luck to him.

Jim H