MailScanner maillog error

[Mariano Absatz]

hint: 
if the line says 
Month day time host sendmail[pid]: ...
then the message was generated by sendmail.
Month day time host Mailscanner[pid]: ...
then the message was generated by MailScanner.

Now, this message is sendmail's, and this means that it couldn't resolve a 
reverse DNS lookup (get host by address) on those addresses. 

Probably, you got connections from those and sendmail tries to resolve them. 
I just tried to resolve them from my dns cache resolver and none of them have 
reverse entries... this is not an error condition, per se... 

It is considered "bad manners" (or incompentce depending on who you ask) not 
to have a reverse dns record for a mail server, and one of the first anti-
spam measures was to deny smtp connections from hosts without a reverse (or 
worse still, those with a reverse that didn't match any A or CNAME for the 
same host).

But as more and more incompetent sysadmins are out there, those kind of 
measures rejected too much legit mail to keep them up...

El 7 Mar 2003 a las 14:11, John Thewlis escribió:

> Hi
> 
> Many thanks for all the help on the /etc/sasldb error, it is now fixed.
> 
> When looking through the MailScanner maillog, I get the following error
> message each time an email is sent through the server:-
> 
> 
> Mar  7 14:05:46 ns MailScanner[18807]: New Batch: Scanning 1 messages, 3034
> bytes
> Mar  7 14:05:46 ns MailScanner[18807]: Virus and Content Scanning: Starting
> Mar  7 14:05:46 ns MailScanner[18807]: Uninfected: Delivered 1 messages
> Mar  7 14:05:46 ns sendmail[29908]: gethostbyaddr(217.114.166.33) failed: 1
> Mar  7 14:05:46 ns sendmail[29908]: gethostbyaddr(217.114.166.34) failed: 1
> Mar  7 14:05:46 ns sendmail[29908]: gethostbyaddr(217.114.166.31) failed: 1
> Mar  7 14:05:46 ns sendmail[29908]: gethostbyaddr(217.114.166.91) failed: 1
> 
> 
> Any ideas as to how to resolve this error?
> 
> Thanks
> 
> John


--
Mariano Absatz
El Baby
----------------------------------------------------------
"Walking on water and developing software from a specification
are easy if both are frozen."
               -- Edward V. Berard, "Life-Cycle Approaches"