"Send this email to other notes mail user(s) through the internet"

Can someone explain what this feature exactly does >

New memo - delvery options - advanced

“Send this email to other notes mail user(s) through the internet”

does smtp relay servers affect this, example domino smtp relays mail to a sendmail server , then to internet

Subject: “Send this email to other notes mail user(s) through the internet”

Hi Ken,

i´m rather sure, it´s an old 4.6-setting. Cause notes could´t handle mime-mails in 4.6, there was an own format, so recepient had seen the formatings of sender.

inexplicable, while it is still in the delivery-options, seems it is a forgotten leftover.

Subject: RE: “Send this email to other notes mail user(s) through the internet”

Thank You !