If I use the hash metod and follow https://www.postfix.org/SASL_README.html
I should write the config file like

/etc/postfix/sasl_passwd:
# Per-sender authentication; see also /etc/postfix/sender_relay.
us...@example.com               username1:password1
us...@example.net               username2:password2
# Login information for the default relayhost.
[mail.isp.example]              username:password
# Alternative form:
# [mail.isp.example]:submission username:password

Therefore I wrote
[smtp-relay.brevo.com]:587  x@y.z:123

But this will NOT work, I have instead write


If you specify the "[" and "]" in the relayhost destination, then you must use 
the same form in the smtp_sasl_password_maps file.
Are you using the same [ ] formatting in both places?
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