Ahhh... thanks Viktor and ptld. Adding an entry for @sub.example.com to
virtual_alias_maps fixed everything.
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On Sat, Apr 01, 2023 at 07:02:51PM +0100, EML via Postfix-users wrote:
> How, exactly, do postfix and dovecot communicate when postfix attempts
> to determine whether to deliver a message to the dovecot LDA, or to
> bounce it? In other words, how does postfix decide to bounce foo, and
> deliver
