On 2017-11-20 21:03, Tom Lane wrote: > "Joshua D. Drake" <j...@commandprompt.com> writes: >> On 11/20/2017 11:40 AM, Magnus Hagander wrote: >> One thing I would note is that there is no longer a footer that >> tells people what to do if they want to unsubscribe. Perhaps one >> thing that could be done is a header (for a temporary time period) >> that says: >> The mailing list software of Postgresql.org has changed. Please see >> this page on instructions on how to manage your subscription and >> filters. And then after the temporary time period that becomes a >> footer? > > Unfortunately, the removal of the footer is a feature not a bug. In > order to be DKIM-compatible and thus help avoid becoming classified > as spammers, we can't mangle message content anymore, just like we > can't mangle the Subject: line. I don't miss the footers, but see RFC 6376, "5.3.1. Body Length Limits". Two fragments quoted are copied below:
> A body length count MAY be specified to limit the signature > calculation to an initial prefix of the body text, measured in > octets. If the body length count is not specified, the entire message > body is signed. > INFORMATIVE RATIONALE: This capability is provided because it is very > common for mailing lists to add trailers to messages (e.g., > instructions on how to get off the list). Until those messages are > also signed, the body length count is a useful tool for the Verifier > since it can, as a matter of policy, accept messages having valid > signatures with extraneous data.
