Bounce on users lists

[Sandro Bonazzola]

Il 15/01/2015 18:31, Michael Scherer ha scritto:
> Hi,
> 
> Itamar, by the proxy of Brian, did asked me to look on the bounce issue
> we have on the users lists. So after a few hours of careful log reading,
> here is my finding.
> 
> The bounce situation
> ---------------------
> 
> We (ml admin) get on a regular basis people who get unsubscribed and
> message about bounce. People being unsubscribed automatically is
> bad(tm), and bounces are annoying. 
> 
> 
> Investigation
> -------------
> 
> A first look show that our mails are bounced as they are marked as spam
> by Google. Google doc on the matter do not give much, some people point
> to using dkim, spf, etc. But spf is not for us, but for the sender, and
> dkim is not ml friendly, afaik, and requires upstream support if I
> understood well.
> 
> Not all mails are bounced, which is good. That mean the ip is not
> problematic. 
> 
> So I took a few hours to look on every bounce and roughly, there is 2
> groups.
> 
> Group 1
> --------
> 
> First group is that all mail from the same poster on the users list have
> bounced at Google. Out of the 16 mail he sent, 16 have been rejected by
> Google. I have no idea why, I suspect the spf policy, but it did looked
> ok. None of the mail of answer had a issue, so that's likely not a
> content problem.  
> 
> However, the ip address of the sender is in the SORBS blacklist, so
> that's likely what trigger Google spam filter.
> 
> Not much we can do, besides contacting him, which I will do.
> 
> Group 2
> --------
> Roughly, that's mail in this thread :
> http://lists.ovirt.org/pipermail/users/2015-January/030494.html
> 
> and the mails from Sandro :
> http://lists.ovirt.org/pipermail/users/2015-January/030420.html
> http://lists.ovirt.org/pipermail/users/2015-January/030423.html
> 
> Common point, use of goo.gl and ur1.ca. It turn out that both domain are
> flagged as URI spam, since that's used by spammer to hide their link. So
> I suspect that Gmail started to "learn" about them as spam, as the rest
> of the world did :
> http://multirbl.valli.org/lookup/ur1.ca.html
> http://multirbl.valli.org/lookup/goo.gl.html
> 
> Again, not much we can do, besides asking to people to not use these
> services ( which is not gonna work I think ).

I may try to use bit.ly red.ht instead of goo.gl.
Can we provide our own url shortener on ovirt.org? That should avoid blacklisting.


> 
> 
> Conclusion
> -----------
> 
> If the core issue is "people are kicked out due to bounce", we can look
> at raising the threshold on mailman ( as proposed by Brian ), while at
> the same time trying to reduce the number of bounce ( ie, a root cause
> investigation on each bounce when we see issue ). 
> 
> First part is easy ( I think ), second is not hard but we need to have
> someone to look at log on a regular basis so that's taking some time. 
> 
> As a side note, our spamassasin setup was blacklisted from the DNS BL we
> used ( due to our use of the dns of linode.com :
> http://uribl.com/refused.shtml ), thus reducing his efficiency. I did
> fixed that by setting a local cache, following the page I gave. If
> anything weird happen, please tell us :)
> 
> 
> Anyone has a opinion or a idea ?
> 
> 
> 
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> 


-- 
Sandro Bonazzola
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