Windows mail servers, without AD, whom to see?

Question

Email

There was a very urgent task to create a mail server for a subsidiary.
In practice, I only know Exchange, which in this case is not an option, since the company does not have an AD infrastructure.
At one time, I met in absentia with Mdaemon and Kerio mail something there, but it was back in 2005.
On Monday I will start testing everything I find. Question to the community, what to test and what good things have appeared over the past 8 years?

By the servers themselves. There will be 3 servers, for different domains. Everything is planned for different virtual machines / physical servers with the base system Windows 2008R2/2012, or rather even the latest, since practically nothing is required from the operating system itself, except for the stability and regularity of patch releases. Given that mail servers often do not change, I think to take the latest operating system, for longer support from Microsoft.

Regarding virtual machines / physical servers, the issue has not been fully resolved, here I am waiting for an answer from our lawyers, since the servers themselves are for different legal entities, questions of licensing small soft ones immediately arise. Therefore, most likely a different living iron.

According to the introductory for postal workers.

Up to 50 users on each, with the possibility of expanding up to 100. At the same time, there are no more than 20 simultaneous sessions per server.
Users live on imap, mail is stored on servers. Mailboxes up to 10 GB.

The software product must support the migration of mailboxes from mdaemon, since they contain archived mail from 2000.

I would be grateful for any recommendations on this topic, including the iron component (which servers to buy)

Answer 1

read about communigate pro.

Answer 2

New MDaemon is quite good
Heavy Artillery

Answer 3

Why Windows?
I am not campaigning for the use of Open-Source, but I would like to know if there will be anything else on the server other than mail? User volumes are not very large,

Answer 4

I campaign not to raise anything, google apps are paid or mail for a domain from Yandex is free, no problems with spam and antivirus, as well as a domain or server ban.

Answer 5

Since I did not find the keyword "free" in the question, I will recommend IBM Lotus Domino. You can also raise the document flow there. That's just the import with mdaemon is in question ...

Answer 6

I would venture to suggest Yandex mail for the domain. A number of organizations have translated up to 100 mailboxes, in general, not bad, no hardware, mailer OS, licenses for antivirus and antispam are needed.
There are also disadvantages. But on the background of free of charge they do not pay attention to them. In the context of a limited budget, IMHO, it is more reliable to choose such a service than to torture for inexpensively raise a very critical service that needs to be maintained and reliably backed up. And that's all money. And on disks in an array and on disks for backups. And the time to recover, when it comes up in a couple of years due to inexpensive hardware that was forced to work 24/7.

Answer 7

hmail server. Free and tasteful