The short question is: can Cyrus IMAP take mail from MySQL tables?

I'm not aware of any such backend; and I think it would be a crazy method to store mail and performance would suck. You may *THINK* MySQL is fast, it isn't - certainly not compared to a filesystem [doubly so when dealling with BLOBs, which is essentially what a mail message is]

And where can I read about how to setup it?

There is a package called DbMail.  Maybe you want to look at that.

The long story is now. I need to setup load-balancing mail system. I
culdn't find open-source mail systems that have genuine cluster
support,

What is "genuine cluster support"?

The main problem is to build a shared storage that can survive server
crashes, where mail will be stored.

Use a SAN.

I have found that MySQL-cluster is
reliable and fast. So, mail will be stored in MySQL tables. And I know
that Postfix can store mail in MySQL. So, I need POP3 server that can
take letters from MySQL tables.

See DbMail.

Is it possible to make such system? Or do you know better solutions
for multiple node load-balancing cluster?

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