Send grid gives you the ability to see if someone opened the email, etc. clearly it was sendgrid that added that (and that's why I don't use sendgrid).
Adam Goldberg 202-507-9900
On Tue, Dec 13, 2016 at 6:52 PM -0500, "Mark Sapiro" <mark@msapiro.net<mailto:mark@msapiro.net>> wrote:
On 12/13/2016 01:31 PM, Kim, DongInn wrote:
I do not know what is going on with the digital signature part but I am wondering if you can take a look at the full raw source of the message and see if there is any clues to debug this issue? This message was sent with my S/MIME signature. http://www.crest.iu.edu/~dikim/mailman_footer.txt <http://www.crest.iu.edu/~dikim/mailman_footer.txt>
The raw source has the correct format of plain text footer but it is ignored and another footer seems to be displayed with the html format. Why does it have two footer contents?
I don't know the answer to that, but I can tell you the Mailman 2.1.23 did not add the text/html footer. Something in the delivery chain after Mailman converted Mailman's text/plain footer into multipart/alternative with Mailman's original text/plain footer as the first alternative and the garbled text/html footer as the second alternative.
A clue is whatever did that also added the web bug
<img src="https://u1524457.ct.sendgrid.net/wf/open?upn=FkTv6GMOKAeoJi-2BuKcaB7j2pviCy3..." alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;"/>
It looks like the first MTA in the delivery chain is ismtpd0003p1sjc2.sendgrid.net and that this is a "smarthost" used by Mailman at isocpp.org for delivery as the message is relayed through ismtpd0003p1sjc2.sendgrid.net, filter0120p1las1.sendgrid.net and o1.30e.fshared.sendgrid.net before being delivered to the MX for indiana.edu.
It is almost 100% certain that it is something at sendgrid.net that is both munging the text/plain footer into the multipart/alternative and adding the web bug to the html alternative.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
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