Re: sendmail and isp relay (aka anti-spam)
Although it may be true that some web servers might not like the envelope sender that
isn't your main problem. If your ISP is flash.net you need to use their smtp server.
If smtp.freewwweb.com would relay mail for anyone who put their return address as
XXX@freewwweb.com then they'd be a spammers heaven. smtp servers only relay (if
they're properly configured to reject spam, as all servers should be) from hosts that
are "local" to them which generally means hosts which are part of their (or their
customer's) network. If you're connecting through flash.net just use flash.net's smtp
server to send mail. It won't care what your return address or envelope sender address
is.
"Allan M. Wind" wrote:
> Hi,
>
> Right now I send out mail using my local smtp server which works fine
> with typically a single drop. This, granted, looks like spam and
> that's why I was considering using my isp as relay. This is where
> sendmail fun begins.
>
> My machine sits on a local lan and has been named master.localnet with
> localnet being 192.168.0.0 and the machine 192.168.0.1. I have a
> preferred email address wind@freewwweb.com which (in theory) will
> remain forever, so I would like to masquerade as freewwweb.com. When
> I moved, I found out that my preferred isp dosn't have a pop in this area
> so I signed up for another isp flash.net.
>
> /etc/hostname:
>
> master
>
> /etc/hosts:
>
> 127.0.0.1 localhost loopback
> 192.168.0.1 master.localnet master
> 192.168.1.1 awind.flash.net awind
> 192.168.1.2 pppd.flash.net
>
> Now, I don't care which ISP that I relay through but after a night of
> playing with this and reading up on sendmail, relay and anti-spam, I
> still haven't been able to crack this.
>
> It seems like part of the problem is that sendmail forwards the
> master.localnet address to the (ISP) relay which rejects it based on
> the fact that the name doesn't resolve (obviously). master.localnet is
> intended to be used for eth0.
>
> /etc/mail/sendmail.mc:
>
> divert(-1)
> VERSIONID(`@(#)sendmail.mc 8.9.3 (Linux) 1999-6-3')
> OSTYPE(debian)dnl
>
> ## Custom configurations below (will be preserved)
>
> # masquerade
> MASQUERADE_AS(freewwweb.com)dnl
> MASQUERADE_DOMAIN(freewwweb.com)dnl
> FEATURE(allmasquerade)dnl
> FEATURE(always_add_domain)dnl
> FEATURE(masquerade_envelope)dnl
>
> # relay/anti-spam
> define(`SMART_HOST', `smtp.freewwweb.com')dnl
> #FEATURE(mailertable, `text -k0 -v1 /etc/mail/mailertable')dnl
> FEATURE(nocanonify)dnl
> FEATURE(rbl)dnl
> #FEATURE(relay_hosts_only)dnl
>
> # misc
> FEATURE(local_procmail)dnl
> FEATURE(nouucp)dnl
> FEATURE(use_cw_file)dnl
> FEATURE(redirect)dnl
>
> # mailers
> MAILER(local)dnl
> MAILER(procmail)dnl
> MAILER(smtp)dnl
>
> Compiled and installed, I get the following error when trying to
> actually relay mail:
>
> ----- Transcript of session follows -----
> ... while talking to smtp.freewwweb.com:
> >>> RCPT To:<wind@sap-help.com>
> <<< 550 <wind@sap-help.com>... Relaying denied
> 550 wind@sap-help.com... User unknown
>
> About the same result when I cahnge SMART_HOST to the smtp host of the
> ISP that I dial into.
>
> Any ideas, suggestions?
>
> /Allan
> --
> Allan M. Wind mailto:wind@sap-help.com
> Manager Information Systems phone: 781.359.9791 (general)
> Integration Associates, Inc. phone: 781.273.0195 ext. 205 (direct)
> 55 Cambridge Street, Suite 301 fax: 781.359.9789
> Burlington, MA 01803 http://www.sap-help.com
>
> --
> Unsubscribe? mail -s unsubscribe debian-user-request@lists.debian.org < /dev/null
--
Jens B. Jorgensen
jjorgens@bdsinc.com
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