Google Groups and Sender header

Since a few days Google Groups mailing lists stopped having a Sender header. Aside from being a violation of RFC 5322 in that this is a SHOULD requirement for mailing lists it also breaks labels in Google Mail as well as procmail filtering. Add to that that moderation messages have strange subjects all of a sudden and I wonder which idiot has been messing around with the mail backend at Google without considering the broader implications.

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