Relay HELO'd using suspicious hostname

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Hello

Bitwarden when sending to a smtp server we host, the smtp server says this

Relay HELO’d using suspicious hostname (IP addr 1)

so it looks like bitwarden is randomising the hostname part? example from our bitwarden.

b9d83e004b4c

can we make the hostname the bitwarden sends uses hostname example bitwarden.example.com instead of b9d83e004b4c ?