Automatic order cancellation emails are sent to many users

HI Forum members,

I have typical issue. From last 3 days, and this problem has occured in past also.

I dont know how, but 30/50 emails are auto sent to multiple users of my website. all the emails are past order cancelled emails. all the emails are sent to 10/20 different users automtically.

I am using a gmail account. i have changed the email password, have activated 2 factor authentication and taken best possible measures in my gmail account.

But the emails are sent from my wordpress automatically to random users.

this is a big issue.

kindly help with the appropriate solution.