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тАО02-03-2005 07:27 AM
тАО02-03-2005 07:27 AM
I understand that DS is the relay to which sendmail should forward email, if it is determined not to be local.
So where does it go if DS is null?
Also: My PCs POP in to this server to get email. There's no guarantee that they are using my sendmail server to send mail, right? i.e. they can configure the mail client to use some other mail server for SMTP, and mine for POP3. Is that correct?
Solved! Go to Solution.
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тАО02-03-2005 07:37 AM
тАО02-03-2005 07:37 AM
Solutionsendmail tries to resolve the DNS entry of the domain name of the mail, directly connect to the mail server on port 25 and deliver the mail.
You can see this happen with the following test:
sendmail -v -d8.99 -d38.99 someone@outside.net
type some text
.
You will see it happen before your eyes.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО02-03-2005 07:38 AM
тАО02-03-2005 07:38 AM
Re: sendmail and DS
Well you can use ruleset 0 to deliver all local domain mail directly IF you have $m macro defined. That's what defines the local domain and it's defined internally from the $j macro.
Also sendmail always checks for DNS MX records for all hosts & will use them if the $S macro (smart relay) is not defined. So DNS may be getting the job done for you as well.
There are several other reasons that involve UUCP, X400 and ldap as well.
SMTP is extremely powerful, customizable and flexible as well w/o having to use the smart relay.
HTH,
Jeff
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тАО02-03-2005 07:51 AM
тАО02-03-2005 07:51 AM
Re: sendmail and DS
So - if I do set the DS macro, I assume that the DNS thing will never happen, and that sendmail will just use the DS host to attempt to deliver?
I'm about to install an anti-spam gateway and it will expect outbound mail to be forewarded it it, for evaluation.
That's why I asked the question about my PC users - they use Eudora mostly. If they set the SMPT server to be some open relay out on the internet someplace, then the outbound mail will go right by my anti-spam gateway.
If that's the case I can block it at my regular firewall (i.e. no mail leaves unless it comes from the anti-spam gateway).
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тАО02-03-2005 07:54 AM
тАО02-03-2005 07:54 AM
Re: sendmail and DS
Then the test results from my test(given to me by hp years ago) will show no lookup, but acceptance by the relay server.
Whatever server you point to will have to explicitly allow relay.'
I do it this way:
DS
[ip_address]
DS
[192.168.0.4]
Others use hostname.
DShostname
My way works when the DNS server is offline but will be broken if the ip addy of the relay server is changed.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО02-03-2005 08:43 AM
тАО02-03-2005 08:43 AM