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" <m...@msapiro.net<mailto:m...@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-2BuKcaB7j2pviCy3ue7m8E6mW8uXY9UnMILQAXAHVBrmmTRd83iYN9USWcOUM8L8ZosPzEP9m1VANGlC-2BxOxriFYBy4Tu1iTEvXSVeZZdQjAkN4o4OHJDdsmqZwygNz8M-2BM97RC-2FW0fJrSW6L-2FeaD7enEkleB4vtP5DiIUsHhgUBZGo-2BNadwAONhlISQa0s2Fu-2FSFTQJJnaQGDVK8HDSBQcwSSSZwM-3D" 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 <m...@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/adam%40agp-llc.com ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org