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<div class="moz-cite-prefix">On 2022-08-18 8:06 p.m., Rick Moen
wrote:<br>
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<blockquote type="cite"
cite="mid:20220819020637.GW22911@linuxmafia.com">
<pre class="moz-quote-pre" wrap="">Quoting BCLUG (<a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:admin@bclug.ca" moz-do-not-send="true">admin@bclug.ca</a>):
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<pre class="moz-quote-pre" wrap="">I got an interesting email today saying this domain was to expire today.
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<pre class="moz-quote-pre" wrap="">Am inferring "this domain" = bclug.ca .
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<pre class="moz-quote-pre" wrap="">Since I just had a legit message from a utility provider that I'd
missed a payment, my first thought was, "Oh no, not again."
But it was fake.</pre>
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<p>I've lost track - because 1/2 of these messages are ending up in
Junk for me. :-)</p>
<p>but it needs to be stressed that SPF provides a suggestion to
other mail servers that the <i><u>SMTP </u></i><i><u>envelope
sender</u></i> (not the From: header field) address can only
originate from listed IPs. SPF does not prevent spoofing of a
From: header, you need DKIM for that. Of course what mail servers
choose to do (or not do) with that information is up to their
Admin.<br>
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<p>Some mail servers will add the envelope sender to the mail
message headers, but many will not.</p>
<pre>Received: from rick by linuxmafia.com with local (Exim 4.72)
(envelope-from <a class="moz-txt-link-rfc2396E" href="mailto:rick@linuxmafia.com"><rick@linuxmafia.com></a>) id 1oOrPC-00058h-6j
for <a class="moz-txt-link-abbreviated" href="mailto:discuss@lists.bclug.ca">discuss@lists.bclug.ca</a>; Thu, 18 Aug 2022 19:06:38 -070</pre>
<p>i.</p>
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<pre class="moz-signature" cols="72">--
Ian Samuel M.Sc. IS LPIC-3
Linux and Infrastructure Architect
"I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better. I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself."
"Elon Musk"
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