Is

smtpd_data_restrictions =
        reject_unauth_pipelining,
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_multi_recipient_bounce

enough to stop this small(?) risk (before I manage to upgrade)?

Gerben Wierda (LinkedIn <https://www.linkedin.com/in/gerbenwierda>, Mastodon 
<https://newsie.social/@gctwnl>)
R&A IT Strategy <https://ea.rna.nl/> (main site)
Book: Chess and the Art of Enterprise Architecture <https://ea.rna.nl/the-book/>
Book: Mastering ArchiMate <https://ea.rna.nl/the-book-edition-iii/>

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