[Mimedefang] sender: <>

[Jurgen Botz]

I'm seeing lots of probes for (usually non-existent) usernames
with "MAIL FROM: <>".  At first I thought maybe I should just
drop those... but then reading the list I saw that apparently
md_check_against_smpt_server does that.  So maybe all these
probes I'm seeing are from mimedefang sites that are getting
spammed by someone who is forging my domain?

 From a standards perspective, it sender '<>' legit?

:j