[exim] Logging of "Sender verify failed"

Hallo experts,

I'm using callout to verify serder addresses.

But why are there *2* lines in the main log? Isn't *1* enough?

Example:

2006-01-25 12:46:18 H=(JASMINA) [82.146.26.XXX] sender verify fail for <XXXXXXX@???>
2006-01-25 12:46:18 H=(JASMINA) [82.146.26.XXX] F=<XXXXXXX@???> rejected RCPT <YYYYYYYY@???>: Sender verify failed

Are ways to reduce this logging?

BTW, the ACL reads:

  deny    hosts = !130.149.0.0/16  : !127.0.0.1
#         message = Unverified sender <$sender_address>
#         log_message = Unverified sender <$sender_address>
         !verify = sender/callout=30s,defer_ok

--Frank Elsner