Help about missing mails

Hello everybody,

I just received a help request from a subscriber of this list, who
doesn't receive mails anymore. Looking into the groups admin page,
showed his mail address being flagged as "undeliverable" yesterday, but
today it isn't flagged anymore and looks good. So theoretically, google
should try to deliver to his account. However he doesn't see any
attempts in his MTA logs that a delivery attempt from google is made.

There is https://support.google.com/a/topic/1262452 but that does not
mention the particular problem here. I am out of ideas here and since
the google groups interface changed a couple of months ago, it doesn't
seem to be possible to get into contact with google itself. It wants me
to sign up for G Suite Admin account (which costs money) before I can
get support.

So to make a long story short, does anybody here knows a personal
contact to google support that could help us resolve this issue here?

Thanks,
Christian

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