Kresolve host -a -T
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That one is ok. Out of just over 21,000 messages our company received today, it blocked only 48 messages. Spammers used to be stupid and use invalid return addresses during the SMTP conversation. Now, they just use something link
[email protected].
Well, with the help of Sendmail.
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If you use M4 to create your config files, the below has done more for us:
FEATURE(`dnsbl', `spews.relays.osirusoft.com', `550 Email rejected')dnl
FEATURE(`dnsbl', `relays.ordb.org', `550 Email rejected')dnl
FEATURE(`dnsbl', `sbl.spamhaus.org', `550 Email rejected')dnl
Those three rules blocked 3,483 messages yesterday. They check three different well-known anti-spam lists. Even with that, more than 99% of what our "main" (webmaster@, info@, order@, ap@, ar@, etc.) address receives is spam. We might get 10 legitimate messages a week to that account, and we receive over a 1,000 pieces of spam garbage a day in that account. The address is listed with the domain name and on several web pages, so spammers added it to their lists a long time ago.z