> On Apr 15, 2017, at 10:31 PM, Dedeco Balaco Baco <dedeco.bal...@yahoo.com> 
> wrote:
> 
> - messages can be sent to any email account

This is not a problem.

> - answers must only be read after the contact is added and the supervisor 
> confirmed its safety

Sounds like quarantining and audit.

Amavisd or similar softwares supports quarantining spam/virus/bad-header/banned 
and also clean messages to SQL database (or file system), you need a web UI to 
view them and release/delete them.
https://amavis.org

> - or each message from strange accounts can be marked as safe without adding 
> the sender to the contact; process repeated for each message

Not sure what this means, but sounds like some kind of whitelisting and 
blacklisting. Is it?

> - messages from contacts are received faster, do not need to be previously 
> read by supervisor account

Like whitelisting. Bypass the quarantine for whitelisted senders.

> - a copy of all messages can be read by the supervisor account at anytime, 
> even after they are erased within the safe account

Use BCC for simple archiving or monitoring, or archive software like Piler: 
http://www.mailpiler.org

> Such a system (or program) is not that hard to develop.

“not that hard”? No matter hard or easy, it takes time.

----
Zhang Huangbin, founder of iRedMail project: http://www.iredmail.org/
Time zone: GMT+8 (China/Beijing).
Available on Telegram: https://t.me/iredmail

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