Re: sendmail question?

[Ben Clewett <B.Clewett@roadrunner.uk.com>]

Another option is to use two copies of Sendmail bound to differenet IP 
addresses, as is now possible.  Each use different sendmail.cf, which 
will not conflict.  Works well for me :)

I advise using /etc/mail_int for all the .cf, .mc, .m4, alias and 
virt-user tables, and /etc/mail_ext for the same on the external.

If your having problems with DNS, install a caching name sever (named) 
and edit /etc/resolve.conf to point to 127.0.0.1.  This can help.  But 
really sendmail and dns are very closelly tied together, and sendmail 
uses dns for a lot of activity.  From validating recipient, validating 
email, checking for a valid MX for the destination host...  Trying to 
run sendmail without dns is simply not a good idea. :)

Best of luck.  PS, the news group comp.mail.sendmail is a better place 
for good feedback.

Ben Clewett.

Jeff Largent wrote:
> 2 servers, one inside firewall that local users use, one outside firewall
> or on dmz that accepts connections from the outside.
> 
> arslan saeed wrote:
> 
>> Hi,
>>
>> We are running sendmail on redhat linux 7.3. When internet 
>> connectivity goes
>> down at times, local users get smtp time-out messages (server not
>> responding). I figured the cause of this message is that by default 
>> sendmail
>> does initial dns lookups on all messages it recieves and in case of 
>> internet
>> connectivity being down, it is not able to do so and produces this 
>> message.
>>
>> so I configured sendmail in defered delivery mode so that it should queue
>> every message and should  not do dns lookups and accept emails from local
>> users in case of internet connectivity being down.
>>
>> However I figured that in defered delivery mode it does not implement 
>> anti
>> spam configuration in access map. When I change delivery mode to defaulot
>> background or queue-only then it looks access maps and prevents mail
>> spamming.
>>
>> Is there anyway to make access maps work in deferred delivery mode. or 
>> any
>> other configuration in which sendmail implements anti spam rules and also
>> does not do initial dns maps so that email could be queued by sendmail 
>> even
>> when it cannot reach internet.
>>
>> thanks
>> arslan.
>>
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>