How to set up forwarding of answers via mail?

Question

Email

Hello.
There is mail on pdd.yandex with its own domain.
There is mail [email protected] - mail of the employee, there is [email protected] (mail "intermediary").
A letter arrives from [email protected] to [email protected], which notifies and forwards incoming mail to [email protected] through a filter.
How to make it so that when replying to [email protected], the letter is sent from [email protected] via [email protected]?
Maybe someone has already done this? Please share.

Goal:
Do something like:
A letter is received from the customer ([email protected]) to the mail (mail "intermediary" - [email protected]), which forwards the incoming letter ([email protected]) to a specific mail to the contractor ([email protected]). The performer has his own mail ([email protected]). The contractor writes a response from his mail ([email protected]) to the customer ([email protected]), but this response should be sent not on behalf of the contractor's mail ([email protected]), but on behalf of the intermediary's mail ([email protected] ru).
Features :
1. [email protected] mail is used using MsOutlook 2016.
2. It is not always necessary to send from [email protected] mail via [email protected], because there are other [email protected], [email protected], etc. + other incoming letters to which the answer must be sent on behalf of [email protected]

Answer 1

well,
I see it like this:
the user Vasya in Outlook has his own account [email protected] + other accounts [email protected], [email protected], [email protected] (all these are real mailboxes)
[email protected] writes to [email protected] Vasya answers him from Outlook from under the account [email protected]
if the director writes to Vasya at [email protected], then Vasya answers from under the account [email protected]
when there are several accounts in the program, she, the program gives a choice from under what answer. The main thing is not to confuse