You want plussed addresses, as in
reach you so that you can presort the junk?
Easy - if you have a Real Mail System. Like sendmail, postfix, exim, qmail or anything else that has come into contact with reality and the relevant rfcs. At worst it's one config entry for the server, at best it works out of the box.
If however you're stuck with MS Excrement Sewer, then you're either totally fucked (older versions) or you need this gem of hideously horrible bloated vbscript "event sink" thingie that sort-of-retrofits the capability. Because the Redmondian Loonieware Doesn't Do Wildcards or anything else that's even remotely useful.
I hate the corporate idiots who made the decision to dump our fully functional email system here @ work to bring in the MS dreck. I HATE YOU!