Email channel - Incorrect Reply-To address used by but

Hi,

I want to enable email channel communication on my on-prem install. I’ve registered an MX record to my test cluster. The bot receives the messages properly, and sends the expected response. However, the Reply-To address is incorrect - MX domain is replaced with one of the servers’ FQDN. Due to this I cannot simply hit reply to the bot, instead I have to add the bot address manually.
MX domain is administered properly in
harakaService/config/me and /KoreConfig.json

What do I miss?

Thanks and Regards,
Janos