As per RFC 5322 §3.6.6, the Resent-From: header field should be
set to the user who has “reintroduced [the message] into the
transport system”:
--cut: urn:ietf:rfc:5322 --
Resent fields are used to identify a message as having been
reintroduced into the transport system by a user. […]
[…]
The resent originator fields indicate the mailbox of the person(s) or
system(s) that resent the message. […]
--cut: urn:ietf:rfc:5322 --
Thus, I'd expect the messages passed via bugs.debian.org to bear
Resent-From: ow...@bugs.debian.org. On the contrary, the
service duplicates From: as Resent-From: instead, like: