When someone contacts the store through the email server, I am getting 5 duplicate emails. Customers are also receiving multiple confirmation emails. How do I fix the multiple email issue?
Default 4.20 doen't have this type of issue.
May be due to third party plugins or anything did you customize at that level?
If you've source code than you should look at contact us post method and message queue insert events.
Otherwise, it will be very hard to find out exact issue.