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SMPT log error message

I am seeing the following error and i'm not sure what it means...

2010:04:19-00:10:39 smtp1-1 exim[21418]: 2010-04-19 00:10:39 id="1003" severity="info" sys="SecureMail" sub="smtp" name="email rejected" srcip="123.20.53.244" from="ofl00%40wetlands-engineering.com" to="elliott%40na.omgi.com" size="-1" reason="rdns_helo" extra="RDNS missing"
2010:04:19-00:10:39 smtp1-1 exim[21418]: 2010-04-19 00:10:39 H=(EJJDUALI) [123.20.53.244]:31443 F= rejected RCPT : No RDNS entry for 123.20.53.244
2010:04:19-00:10:39 smtp1-1 exim[21418]: 2010-04-19 00:10:39 SMTP connection from (EJJDUALI) [123.20.53.244]:31443 closed by DROP in ACL

Thoughts?

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0 BAlfson over 15 years ago

A client and we experienced a similar issue last year. It seems that this phenomenon is a result of your ISP doing DNS hijacking. The way the RBL works is that it resolves the request when when the IP is blacklisted. When your ISP's nameserver returns a valid IP, the Astaro assumes the email is from a blacklisted IP. OpenDNS is "RBL friendly" and should not cause these problems.

When I complained to the local Cox technicians, it seemed from their subsequent commentary that they had gotten their knuckles rapped when they escalated my issue to Atlanta. I have no complaints with Cox; they aren't uniqu among large ISPs in doing DNS hijacking to be able to do a little advertising.

Cheers - Bob

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0 BAlfson over 15 years ago

A client and we experienced a similar issue last year. It seems that this phenomenon is a result of your ISP doing DNS hijacking. The way the RBL works is that it resolves the request when when the IP is blacklisted. When your ISP's nameserver returns a valid IP, the Astaro assumes the email is from a blacklisted IP. OpenDNS is "RBL friendly" and should not cause these problems.

When I complained to the local Cox technicians, it seemed from their subsequent commentary that they had gotten their knuckles rapped when they escalated my issue to Atlanta. I have no complaints with Cox; they aren't uniqu among large ISPs in doing DNS hijacking to be able to do a little advertising.

Cheers - Bob

Sophos UTM Community Moderator
Sophos Certified Architect - UTM
Sophos Certified Engineer - XG
Gold Solution Partner since 2005

MediaSoft, Inc. USA
Cancel
Vote Up 0 Vote Down

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