[Mailman-Users] footer format

Mark Sapiro mark at msapiro.net
Tue Dec 13 18:51:47 EST 2016

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

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

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 at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

More information about the Mailman-Users mailing list