Question about linking an incoming email (lead) to a specific deal?

Question

Bitrix24

There is a company. The Company has several transactions. The contact person sends two letters. The first letter refers to deal #1, the second letter to deal #2.
Attention to the question: how to link letter No. 1 to deal No. 1, and letter No. 2 to deal No. 2.

Answer 1

Attention to the question: how to link letter No. 1 to deal No. 1, and letter No. 2 to deal No. 2.

Bitrix has a regular mechanism for attaching letters to crm entities, but it only works if the letter is answered.
If these are 2 independent letters that the contact wrote himself, then there is no way to automatically distribute them.

The contact person sends two letters. The first letter refers to deal #1, the second letter to deal #2.

In a boxed solution, it is possible to rewrite these algorithms, but this is not an easy task.