Zoho Desk came with  support@examplename.zohodesk.com

I should mention we are on the free plan

We made a forwarding address on our domain: helpdesk@examplename.com to forward to there

Works fine, only when I communicate with someone and they hit reply it sends it to both addresses, and so I get two email notifications and see two responses on their ticket

Any way to not have duplicates in this case?