post...@aecperformance.com:
> I attempted to send an email to smok...@sizzelicks.com. It bounced.

Wietse:
> What is the Postfix logging for this? Be sure to include more than only the
> delivery error (i.e. logging from pickup or smtpd; cleanup; qmgr; ...).
> This is the first problem that you need to fix.

post...@aecperformance.com:
> I'm not sure what you mean here.

LOGS from the machine that runs Postfix, for your attempt to send
mail to smok...@sizzelicks.com.

Here's what is looged when I send email to smok...@sizzelicks.com:

Dec  6 12:31:33 spike postfix/smtp[22522]: 4J79T171qVzJrP1: 
to=<smok...@sizzelicks.com>, 
relay=mail.sizzelicks.com[2a02:4780:10:e096::1]:25, delay=15, 
delays=0.13/0.012/15/0.16, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 
ECEDAA06C5)

You can the corresponding logs at your end by searching for "ECEDAA06C5".

Your mail client reports:

> 'smok...@sizzelicks.com' on 12/6/2021 11:22 AM
>      Server error: '550 No Such User Here"'

That does not look like a Postfix response. What system is returning these
results to you?

        Wietse

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