I am running three debian email servers and recently wanted to address spam coming in to them. One sever is sendmail version 8.14.4 the other two are 8.14.3. All three servers exhibit the same behavior.
I added milter-greylist to each of them, it works brilliantly, stopping better than 50% of incoming spam.
I then tried to install realtime dns blacklist checking using three popular free services with entries to my /etc/mail/sendmail.mc file.
Two of the services, bl.spamcop.net and dnsbl.sorbs.net cause sendmail to reject every single incoming message as observed in my /var/log/mail.log file.
The third black list service, zen.spamhaus.org when enabled, doesn't seem to do anything at all.
I have tried all sorts of combinations, disabling greylisting, inserting the ipv6 workaround ( define(`DNSBL_MAP'...), using the enhanced blacklist feature "enhdnsbl" and activating only one blacklist at a time. Each time recompiling my sendmail.mc file and restarting sendmail.
I cannot find any references to others that have had this behavior and I'm at a loss as how to troubleshoot it from here.
If anyone has any suggestions or comments, they are greatly appreciated.
My sendmail.mc follows at the end of this posting.
Hi all,
I have read about sendmail running as 2 separate process.
1 as a MSP, and the other as the real daemon or MTA.
In my current configuration,
the sendmail-client is disabled.
Both submit.cf and sendmail.cf are left as default untouch
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530 5.7.1 Authentication required
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where ?
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