Ask HN: How do we replace our POP3 email solution?

Rackspace Mail handles this for over 3 million business users. Their hosted e-mail is fully managed with a 100% uptime SLA and 24/7/365 live support. It's only $2 per mailbox per month.

https://www.rackspace.com/en-us/email-hosting/webmail

• Cyrus – it's used by Fastmail and others, and with its perl API somewhat manageable. We e.g. put all configuration in Active Directory and sync it over with said API. It also has reasonable clustering and replication support.

• Google Apps.

Ars Technica had an article about running your own mailserver, to include IMAP, awhile back (http://arstechnica.com/information-technology/2014/02/how-to... while it's targeted at the individual user, a lot of the steps would apply to a larger, multi-server organisation. You could extend postfix with a PostgreSQL database, split the different servers onto different hosts &c.

Honestly, these days it's probably easier and cheaper to just buy Google Apps or Office365, but if you want to control your own destiny it's really not difficult.

You should be able to at least add IMAP instead of POP3, no?

Why host it yourself? Outsource this.

Options include:

  - Migrate mails over to SaaS (Gmail, Amazon mail, or Exchange online) .. Probably the best option, unless you want to run your own
  - Run a "full featured" open-source mail service like Zimbra on servers on any cloud of your choosing!
  - Run a simpler old-school mail solution, like postfix + https://roundcube.net/ for better access

Actually if you need help doing this migration, I'd be happy to help (I'm mostly an Ops person)

try https://mail.zoho.com

With email, you want simple, turnkey, and ideally self service.

Free::

http://modoboa.org/en/

http://www.iredmail.org/ ... also has paid version

Paid::

http://www.afterlogic.com/mailsuite/linux-email-server

https://www.atmail.com/

With each of the options above, you get the complete stack.

::Email server (IMAP + SMTP + POP3)

::Spam protection etc

::Web Client.

And for each of them, you also get a decent web admin panel out of the box.

Trust me, you really don't want to be spending the next week putting the individual components together and getting them to play nice yourself.

Do you have more than 20,000 people? Special security requirements?

If no, move to Google or Microsoft.

Just use Mail-In-A-Box. It does IMAP and POP.

https://mailinabox.email/