Nuno Catarino via Postfix-users:
> postfix/smtp[31278]: CFC982C034E: to=<em...@gmail.com>,
> relay=smtp.gmail.com[64.233.167.109]:587,
> delay=5.5, delays=0.05/0/5.4/0, dsn=4.7.0, status=deferred (SASL
> authentication failed; cannot authenticate to server
> smtp.gmail.com[64.233.167.109]:
> invalid parameter supplied)

Here is a hint:

https://www.cyrusimap.org/sasl/sasl/reference/manpages/library/sasl_errors.html
lists all Cyrus SASL error codes, one of which is:

    SASL_BADPARAM
        Invalid Parameter Supplied

There are many search engine hits for "invalid parameter supplied" and they
involve Cyrus LDAP support. 

Another hit:
https://askubuntu.com/questions/1189871/postfix-saslnot-workign-on-upgrade-to-19-10o

The solution could be as simple as:

/etc/postfix/main.cf:
    smtp_sasl_mechanism_filter = login plain

        Wietse
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