Hi
> We receive one mails with 3 recipients of this domains, this should be normally 3 mails in the catch-all-mailbox, but exim deliver just the first
one and discard the other two.
> Any idea how to suppress this behavior ??
NO, don't do that.
How do you deliver mails that are taken from the catch-all-mailbox?
You cannot use default headers, because of BCC mails.
But you can use Envelope-To: headers, if enabled in exim.
In your case above (with 3 receipients), Envelope-To: will have multiple
addresses.
Your delivery agent can then deliver that mail to all receipients. And your
line is not busy transfering multiple mails.