To turn off receipts you send to others, Zoho Mail lets you choose how to answer requests: always send, never send, or ask me. A receipt only says that the recipient’s program reported an opening.
HawkOpen does not use read receipts. You can connect a Zoho Mail mailbox to HawkOpen with IMAP and SMTP, using the server names, ports and password from your provider (many providers ask for an app password), and send tracked emails from the HawkOpen dashboard. Only mail servers on public addresses are accepted, by default on ports 465 or 587 for SMTP and 143 or 993 for IMAP. HawkOpen is in a controlled launch, so each provider connection is verified before it is offered in production.
The HawkOpen browser extension works in Gmail, Outlook on the web and Yahoo Mail, not inside Zoho Mail; with a Zoho mailbox you write and send tracked emails in the HawkOpen dashboard.
Every email tracked by HawkOpen ends with a short notice that it contains tracking elements, with a link where the recipient can turn tracking off. An open is an estimate, not proof that someone read the email.
Where rules that require consent apply, tracking may start only after that consent has been obtained. The link in the message lets the recipient withdraw consent later.