Spam-anomália

Megáll az eszem. Kezd az lenni az érzésem, hogy bizonyos rendszerek spammerként kezelik a címem. Aztán az is lehet, hogy nem, de mintha. A levél így fest:

Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<>:
217.20.133.52 does not like recipient.
Remote host said: 550-Sorry, 66.163.179.152 is in a black list at dnsbl.sorbs.net
550-Escalated Listing (Spam or Spam Support) See:
550 http://www.sorbs.net/lookup.shtml?66.163.179.152
Giving up on 217.20.133.52.

Okos informaták, segítsetek!