I just noticed on a MUUG Round Table e-mail today, the following at the bottom:
> Roundtable mailing list -- roundtable(a)muug.ca
> To unsubscribe send an email to roundtable-leave(a)muug.ca
>
Regarding the second line (the unsubscribe), I sure hope MUUG at least does SPF/DKIM verification before acting on such an incoming e-mail, because otherwise, a rogue actor out there could unsubscribe any or all of us!
Even so, SPF/DKIM verification would only fully protect those of us (like me) who use our own domain name.
Hartmut