Looks like Meetup censored its own email addresses from the header of the emails I just sent as they appeared to readers of the LPSF Meetup group's email list!
Besides the non-functional "info@...", I also sent those emails to support@..., and billingsupport@... (see attached screenshot). But those Meetup corporate addresses were scrubbed from the messages as they appeared on the group email list.
(Attachment EvidenceOfMeetupCensorship.jpeg is missing)