==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
Spider version 2.7.9
Exim mail server
====

Hello. I have installed a test licence to, of course, test Spider

I have set up A and MX record for it and it should be good. The SSL certificate was activated without any trouble. Then I have set the Archiving Address as needed.

My mail server is Exim, and I have added the needed code that is similar to this one:
bcc_archiver_router:
  driver = redirect
  condition = ${if or {{match_domain{$sender_address_domain}{domain.tld}}\
                       {match_domain{$domain}{domain.tld}}}}
  data = arhiva@spider.domain.tld
  no_verify
  no_expn
  unseen

When sending and receiving messages for the specified domain, the Exim server seems to be doing the right thing, but can't deliver:

2025-09-26 22:45:37 1v2ENt-0000000BLmt-19T4 ** archive@spider.domain.tld <user@domain.tld> F=<some.user@some-domain.eu> R=lookuphost_forward_router T=remote_smtp_forward_transport H=spider.domain.tld [XXX.XXX.XXX.96] X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=yes: SMTP error from remote mail server after RCPT TO:archive@spider.domain.tld>: 550 5.1.1 <archive@spider.domain.tld>: Recipient address rejected: User unknown

Any idea what the problem could be, or what else should I check?

Regards,
Dan