Dumb question: listserv or list-serv?

[buckweaver]

Or Listserv? Or list server?

My gut says listserv (and so does Webster's.) But I'll use a lifeline and see what the audience has to say.

 

[ondeadline]

I've never seen it with a hyphen.

 

[EStreetJoe]

I've seen it both ways, but no hyphen is the correct way.

 

[The Big Ragu]

I've never seen it with a hyphen until your post.