Multiple "send" addresses

[eludlow]

I have a friend who uses Mozilla, which allows him to send via his
normal ISP's SMTP server from a different address. This sounds rather
confusing, so I'll post how he described this system....

I'm using Mozilla, an excellent mailer/browser/FTP/everything else
package,
which allows you to set up multiple "send" addresses all using the
same SMTP
server. It flags outgoing mail so that it recognises its own
bounces, even if
they are from a totally different address (such as xxxxx.org.uk or
yyyy.net or zzzz.org.uk or zzzz.org).

Is this possible to do in Outlook?

I hope you get what I mean - reading through the above, it does sound
rather confusing

Many thanks,
Ed Ludlow