[exim] Repeating log entries but no traffic

I get these log entries each and every minute since about a week ago,
but when I run 'tcpdump host 62.65.23.248' I see absolutely no traffic!

What's going on? How can I stop it?

2006-10-14 17:16:33 host name alias list truncated for 62.65.23.248
2006-10-14 17:16:33 no IP address found for host
mail.xn--g-ner-i-vikt-tcb.se (during SMTP connection from [62.65.23.248])
2006-10-14 17:16:33 no IP address found for host mail.atg.nu (during
SMTP connection from [62.65.23.248])
2006-10-14 17:16:33 no IP address found for host mail.mh2e.com (during
SMTP connection from [62.65.23.248])
2006-10-14 17:16:33 no IP address found for host mail.unit.nu (during
SMTP connection from [62.65.23.248])
2006-10-14 17:16:34 no IP address found for host mail.donum.se (during
SMTP connection from [62.65.23.248])

--
Andreas