The image of your process is not very clear. What are the incoming branches to your gateway and where is the email service task that is sending the emails? 

This documentation may help: https://www.laserfiche.com/support/webhelp/Laserfiche/10/en-US/administration/#../Subsystems/Forms/Content/Gateways.htm?Highlight=merging%20gateways

When using gateways to merge branches, exclusive gateways will let each incoming branch through immediately. That means if you have three branches coming into the exclusive gateway, there will be 3 occurrences of all the steps after the gateway. If you merge using an inclusive gateway, the gateway will wait for all active incoming threads to finish before moving on. If you have 3 active incoming branches, if one finishes and gets to the gateway before the others, it will wait for the other 2 to finish. Once all 3 branches are complete, the process moves on to the next step and each step after the gateway will only happen once.