<div dir="ltr">Hi,<div><br></div><div>Monitoring the mail system, I've found that Google still has us rate limited. Trying to understand why, I've come up with the following reason:</div><div><br></div><div>Google verifies DKIM as part of their criteria for identifying SPAM. We sign our outgoing mail, so, there shouldn't be a problem. However, some mail *already* has a DKIM signature. Still no problem, but most mailing lists change the Subject: line by prepending the mailing list name.</div><div><br></div><div>Now *that*'s a problem: it invalidates the pre-existing signature! So, simply strip the old DKIM headers, you might say. That will make the problem go away. Well, in fact it probably doesn't: domains which use DKIM can also state a policy that all mail from the domain should be signed. Stripping the DKIM signature makes the mail invalid with respect to that policy, again triggering the SPAM rules.</div><div><br></div><div>My conclusion: we have to stop munging the Subject: line in the mailman mailing lists.</div><div><br></div><div>Any comments?<br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">Bye,<div><br></div><div>Erik.</div><div><br></div><div><a href="http://efficito.com/" target="_blank">http://efficito.com</a> -- Hosted accounting and ERP.</div><div>Robust and Flexible. No vendor lock-in.</div></div></div>
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