From: Ben Clewett <B.Clewett@roadrunner.uk.com>
To: Jeff Largent <jlargent@imagelinks.com>
Cc: arslan saeed <arslan@tele.net.pk>, linux-admin@vger.kernel.org
Subject: Re: sendmail question?
Date: Mon, 17 Mar 2003 09:10:41 +0000 [thread overview]
Message-ID: <3E759111.9000900@roadrunner.uk.com> (raw)
In-Reply-To: <3E723F11.6060608@imagelinks.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.
>>
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
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>>
>>
>
prev parent reply other threads:[~2003-03-17 9:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-14 19:43 sendmail question? arslan saeed
2003-03-14 20:44 ` Jeff Largent
2003-03-17 9:10 ` Ben Clewett [this message]
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