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Antispam programs (such as Spamassassin) use a system of scores to
discover spam. A mail will be tested for everything from known spammy
phrases, missing/suspicious headers, to which server it came from. To
do this your mailserver is checked against IP blacklist databases for
being a known spamming address, checked wither it has a reverse DNS
entry (ensures it is not a dymanic IP) and SPF records matching the
domain the email claims to come from.<br>
<br>
If I am interpreting the contents of my /usr/share/spamassassin
correctly, then spamassassin penalises incoming email lacking an SPF
record with a score of up to 2.5. Since some mailservers just bounce
anything with scores between 5 and 10, and /dev/null anything with a
score of 10, so I guess it is important to make sure the domain from
which you are sending will need an SPF record in yourdomain.co.uk's DNS
which reflects the IP of your mailserver. <br>
<br>
Alan<br>
<br>
On 17/12/10 12:36, Peter Childs wrote:
<blockquote
cite="mid:AANLkTiminW0YMLJ+NLQAKER-RZo+w+N3MR1sdgfffR41@mail.gmail.com"
type="cite"><br>
<br>
<div class="gmail_quote">On 17 December 2010 12:11, Paul Littlefield <span
dir="ltr"><<a moz-do-not-send="true" href="mailto:info@paully.co.uk">info@paully.co.uk</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Set
up a 'smart host' in sendmail to use your ISP's SMTP server to send
mail.<br>
<br>
e.g.<br>
<br>
define(`SMART_HOST',`[<a moz-do-not-send="true"
href="http://auth.smtp.1and1.co.uk" target="_blank">auth.smtp.1and1.co.uk</a>]')<br>
<br>
Shout if you want more info or links.<br>
<br>
Paully
<div>
<div class="h5"><br>
<br>
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target="_blank">Kent@mailman.lug.org.uk</a><br>
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href="https://mailman.lug.org.uk/mailman/listinfo/kent" target="_blank">https://mailman.lug.org.uk/mailman/listinfo/kent</a><br>
</div>
</div>
</blockquote>
</div>
<br>
Thats what I'm doing currently. (Except I'm using Exim) the issue is
that certainly 1and1 limit you to 1 email every 10 seconds (which is
not really very many for a peak load). I've seen similar limits from
most other ISPs<br>
<br>
Trying to get your reverse DNS to match is a pain, Would using a shared
hosting supplier fix this issue?<br>
<br>
My reading is that part of the problem is the need for SPF records.....<br>
<br>
Peter.<br>
<br>
<pre wrap="">
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<a class="moz-txt-link-freetext" href="https://mailman.lug.org.uk/mailman/listinfo/kent">https://mailman.lug.org.uk/mailman/listinfo/kent</a></pre>
</blockquote>
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