replying to non-existing subdomain

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    We have a domain,
    We have an external website People can send and receive emails to / from that site (it has a built-in email server).

    If the user from our domain sends an email to [email protected], the emails are sent fine.
    if they reply to an email sent from [email protected], the addresses are modified to [email protected] and they get a NDR if they try to reply to it.
    So far, the solution is to manually change the address they want to send to.

    What should I do so that they can just hit “reply” and the addresses are correct? Would the creation of a subdomain fix the problem?

    Thanks in advance

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