P.S. How to debug delivery?
I inserted into the beginning of rcpt ACL:
warn domains = tiscali.cz
control = debug/tag=.$message_exim_id/opts=+all
The debuglog contains only lines with pid of the receiving process,
including:
20:18:58 18029 DSN: **** SPOOL_OUT - address: |doma*@ tiscali.cz| errorsto: |NULL| orcpt: |NULL| dsn_flags: 24
I invoked Exim with the message at stdin:
exim -d+all -i -t <a/a >tis1 2>tis2
but that way the bug(?) didn't manifest, a normal DSN was generated.
That line was slightly different:
20:46:51 28502 DSN: **** SPOOL_OUT - address: |doma*@ tiscali.cz| errorsto: |NULL| orcpt: |NULL| dsn_flags: 0
What is "dsn_flags"?