Steve Brown via Mailman-users writes:
"For a while now, my e-mail for this list (but not other lists) just shows "To RADG" from "RADG" with a "CC" showing the actual sender's address.
It's very difficult to figure out what's going on with such an abbreviated description of what he's seeing.
It may be possible to get better results with alterative settings on the list.
In the settings for RADG, under "Alter Messages", what are the settings for "First strip Reply-To", "Reply goes to list", and "Explicit reply-to address"?
Under "DMARC mitigations", what are the settings for "DMARC mitigation action" and "DMARC mitigate unconditionally"?
Because some other members, including me, have had problems with unexpected entries in both From and To lines, I suspect that Mailman 3 does the DMARC enough differently
The only thing I can think of that might allow other lists to have author names for other lists but not for a Mailman list is that the MUAs are parsing email addresses out of the display name (which is a horrible risk, given the flexibility that users have in setting email headers, and especially display names). If there is no email address, then they completely ignore the content of the display name in favor of their preferred display name for the list.
My understanding is that all of the recent posts are missing the poster's name, after behaving as expected for some time. Something must have changed, but what is baffling me. If you have any further ideas, fine, but don't waste a lot of time on this.
MUA "upgrade" seems like as likely an explanation as any. I think if you want to know details what's going on for a particular user, their MUA's support channels are the best bet.
-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan