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тАО01-12-2006 04:58 AM
тАО01-12-2006 04:58 AM
Solved! Go to Solution.
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тАО01-12-2006 05:12 AM
тАО01-12-2006 05:12 AM
Re: Sendmail and DNS host checking
You could limit it - so that DNS isn't configured at all on the server.
Rgds...Geoff
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тАО01-12-2006 05:14 AM
тАО01-12-2006 05:14 AM
Re: Sendmail and DNS host checking
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тАО01-12-2006 05:16 AM
тАО01-12-2006 05:16 AM
Re: Sendmail and DNS host checking
Check this file
/etc/mail/service.switch
007
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тАО01-12-2006 05:25 AM
тАО01-12-2006 05:25 AM
Re: Sendmail and DNS host checking
See:
http://aplawrence.com/Bofcusm/22.html
Rgds...Geoff
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тАО01-12-2006 05:27 AM
тАО01-12-2006 05:27 AM
Re: Sendmail and DNS host checking
# service switch file (ignored on HP-UX, Solaris, Ultrix, OSF/1, others)
#O ServiceSwitchFile=/etc/mail/service.switch
Sorry about that...Geoff
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тАО01-12-2006 05:34 AM
тАО01-12-2006 05:34 AM
Re: Sendmail and DNS host checking
http://www.sendmail.org/faq/section3.html#3.22
Rgds...Geoff
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тАО01-12-2006 05:34 AM
тАО01-12-2006 05:34 AM
Re: Sendmail and DNS host checking
Any e-mail originating outside our network is currently looked up in DNS to check the validity of the sending domain; anything that does not resolve gets rejected. I am trying to avoid that. I want all mail to be accepted. Yes, I have additional security in place to help prevent bad stuff.
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тАО01-12-2006 05:58 AM
тАО01-12-2006 05:58 AM
Solution1) connection of the RELAY - modern sendmail configurations want the RELAY to be defined in DNS
2) MAIL FROM: the domain portion of the users from address must generally look up in DNS.
You can bypass these features.
Get familiar with the README in
/usr/contrib/sendmail/usr/newconfig/etc/mail/cf
look at the accept_unresolvable_domains feature and the
You may need more. If you do, test commenting the
check_mail
check_rcpt
check_relay
rules in sendmail.cf. You won't need them all. If you're scared of M4/ you'll find gen_cf in a subdirectory of
/usr/contrib/sendmail/usr/newconfig/etc/mail//cf/cf
it uses menus.
These techniques bypass many of the anti-spam rules in sendmail.
If you've got more questions, ask 'em.
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тАО01-12-2006 06:08 AM
тАО01-12-2006 06:08 AM
Re: Sendmail and DNS host checking
Use space as separator for the options.