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Bryan,

... the e-mail addresses of people posting are being changed. For
example, a post I made had the e-mail address as
tubaman21@... and

That is done with Yahoo Mail and a few other email services. The short story is that those email services don't want your messages delivered through a mailing list, at least not under your name. The reasons are basically the same as Yahoo Group's mangling of email From addresses.

If you want the long version, the keyword is DMARC.

Is this a setting or what is going on here?

Nope, it is something you just have to live with.

The second complaint I got was about the default footer. ... Is there
a way to remove it or shorten it?

Nope. You can lengthen it with a group-specific footer, but you can't shorten it.

Shal
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