In the light of #277 and Project Hexanet's internal needs. Here is the list of things to do:

• Migrate to go-imap v2 #259

Refactoring:

• Refactor imapsql blob storage interface to use modules framework #303
• Replace updatepipe package written for go-imap v1 with a better update dispatcher.
• Implement support for some distributed broker - to be used with IMAP updates distribution.
• Create abstraction for SMTP queue storage #262.
• S3 blob storage #304

Several queries should be optimized/reworked in go-imap-sql in order to behave well in a distributed environment:

• Get rid of "marking" logic in message removal go-imap-sql#28
• Expunge does two (!) full table scans go-imap-sql#33

Officially support CockroachDB:

• CockroachDB support go-imap-sql#5
• Officially support CockroachDB use with auth.sql_table/auth.sql_query.

In other words, we have a long way to go. :)