I don't know what all can be done to deal with this, but I believe that full email addresses are always presented in the archives webpages for a list, provided the subscriber is logged in. So if you can keep people reminded that they can refer to the list archives...

On Wed, 4 Oct 2017 15:31:46 +0000, Russell Hunt <[log in to unmask]> wrote:

>Recently on the list I own I've been encountering requests for people to contact senders off list so that they can get their email addresses and take conversations off list. I believe this has become necessary because some email clients (e.g, most egregiously, Outlook) hide the sender's email address, displaying only the name under an "on behalf of."

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