StartCom does.
CAcert used to, though I don't know if they STILL do, I would guess so.
> Date: Wed, 14 Oct 2009 12:18:37 -0700
> From: nel...@bolyard.me
> To: dev-tech-crypto@lists.mozilla.org
> Subject: Does any free email CA offer certs with multiple email addresses?
>
> You probably know by now that Thawte has announced an end to its free
> email certificate service.
>
> http://www.h-online.com/security/Thawte-discontinues-Web-of-Trust-for-free-SSL-certificates--/news/114447
>
>
> https://siteseal.thawte.com/support/index.html?page=content&id=SO12658
>
> This has caused many people to start looking around for a substitute.
> Today, I received this email from a colleague about this subject.
>
> > I found http://kb.mozillazine.org/Getting_an_SMIME_certificate
> >
> > I couldn't find any trusted-by-NSS CA that offers multiple email
> > addresses in a single cert (subject alt name extension). Thawte offered
> > it and it worked well for me.
> >
> > The only one that offers it is CACert. I'm tempted to trust the CACert
> > root for email users.
> --
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