Bill Robertson
Yes, I've looked at that list but the majority of the links don't mention MM3 hosting (so I don't know how old it is)
In principle, the oldest entries should be at the top (first come, first serve). We make no effort to check on whether these sites are live. (If you get a 404, we'd appreciate knowing about it!) I would be quite surprised if the newer ones don't offer Mailman 3. Here's what I know about the entries. The fact that I say I don:t know them means only that they don't frequently appear on our mailing lists -- I'm a developer, not a competitor in the field. They may be *very* competent and competitively priced vendors. Country of primary operation in parentheses (eg, (DE) is Germany).
minuskel screen partner GmbH<http://www.minuskel.de> (DE) Don't know them. They've been around for decades, guessing from their Plone offering.
'''POWER-NETZ.de'''<http://POWER-NETZ.de> (Symgenius GmbH & Co. KG) (DE) Don't know them.
EMWD<https://mailman3host.com/> (US) The previous proprietor was very helpful to random questioners on the list, and limited his self-promotion to "EMWD offers hosting". He provided an fdisk to boot a working Mailman 3 guide based on his installation experient. RIP Brian. The new operators keep a low profile, but Brian left them a bullet-proof system, and his heirs were careful in selecting them.
UK Web Hosting<http://www.eukhost.com> (UK) Don't know them.
'''Virtual Dedicated Hosting'''<http://www.micfo.com> (??) Don't know them.
Web Hosting UK<http://www.webhosting.uk.com/> (UK) Don't know them.
JPBerlin<http://www.jpberlin.de> (DE) Don't know them.
MEMSET Dedicated Server Hosting<http://www.memset.com/> (UK) Don't know them.
MailmanLists<http://www.mailmanlists.net> (US, UK, EU, AU) Don't know them.
Binhost Technologies<http://www.binhost.com>: (??) Don't know them.
'''VPS Hosting at VPSLink'''<http://vpslink.com> (??) Don't know them.
'''Shared, VPS or Dedicated Server Hosting with cPanel/WHM and Mailman Support in North America or Europe'''<https://www.ezoshosting.com/hosting-solutions/> (US, DE) Don't know them.
Assam Company of America<http://www.assamcompany.com> (US) Don't know them.
A2 Hosting<http://www.a2hosting.com> (??) Don't know them.
Ingate<http://www.ingate.de/managed-server.html> (EU). Don't know them.
'''Web Hosting UK'''<http://www.nethosted.co.uk> (UK) Don't know them, different URL from similar blurb above.
Aplonis Solutions<http://www.aplonis.com> (??) Don't know them.
Carringbush.Net<http://www.carringbush.net/> (AU) Don't know them.
Mailmanhost.com<http://www.mailmanhost.com> (US) Same as EMWD above.
UAENIP<http://www.uaenip.com> (EU) Don't know them.
Dataflame (UK) Don't know them.
RoseHosting<https://www.rosehosting.com/> (US) Don't know them.
Mailman3.com<https://mailman3.com> (??) Aggressive product marketing, proprietor is a frequent Mailman contributor. Mailman3.com is a proprietary site, not affiliated with the GNU Mailman 3 Project.
MaadiX - Mailman 3 one click install<https://maadix.net/>: (??) Don't know them.
KnownHost - VPS Hosting Provider<https://www.knownhost.com/> (??) Don't know them.
dotList<https://www.mailmanhost.com/mailman-3-hosting/> (US) Same as EMWD above.
Panix, in New York City, USA, offers Mailman 2 hosting<http://www.panix.com/email/mlist.html> (US) Well-known ISP of long standing.
Mailman 4<https://mailman4.com/> (??) Same as Mailman3.com above. GNU Mailman 4 does not exist, and this site should be considered a marketing ploy -- the actual software is GNU Mailman 3 AFAIK, possibly with a few proprietary extensions. Mailman4.com is a proprietary site, not affiliated with the GNU Mailman 3 Project.