neetoCRM now has the option to assign a lead/deal to an email, be it smart mails or synced emails.
Go to
Mail's show page->Assign lead/deal->Add new lead/deal.When you try to create a lead, then by default, it pre-fills lead details in the form with help of email. You can verify the details and add a new lead.
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For deal, you would need to enter details in the deal form.