Mail file on different server

Hi admins,

must be a simple question - but I did not find the answer…

2 domino servers in the same domain,

my home server is serverA,

home server (=mail file) of user JDoe is serverB.

if I send a mail to JDoe/MYCOMPANY the router deliveres it correctly to serverB,

but if I send a mail to jdoe@mycompany.com (which is his internet email address in his person document in the dd), my server sends it to the internet!).

This happens only, if I address it to a person (or a mailin-db) on a different server. If the addressee has his mail file on the same server (serverA), then a mail sent to “hisinternet@dress.com” is delivered directly into his mail file).

So there must be a server configuration setting which I missed… ??

Thanks in advance

Uwe