What service/plugin for notification of read sent email?

Question

Email

Hello. Please advise a service/plugin that will send a notification that a sent private message has been read by the recipient.
Need support for Yandex.Mail.
* I'm a little distrustful of such services, because. they need to open access to their mailbox.

Answer 1

there is no such thing
, but you can use the hubspot free version