How does checkmark feature work in Gmail plugin?
There are three variants of the check-mark icon that you usually see in your Gmail inbox where our Gmail plugin is active.
A double checkmark in grey color
Grey double tick denotes that the email was not sent through SalesHandy's Chrome plugin.
A single checkmark in blue color
A single blue tick with a grey tick denotes that the recipient has received the email but yet open the email.
A double checkmark in blue color
Blue double tick denotes that the recipient has opened the email.
An exclamation mark denotes the mail is bounced. In this case, please verify the email address of the recipient.
Refer to the GIF below to understand this process practically: