I have Sendinblue as a smtp mail relay server and I get this error when I send a mail out----
Diagnostic-Code: smtp; 530 Error: authentication Required —
What could be the problem?
And this is what I added in postfix main.cf::
smtp_sasl_password_maps = static:myblahusername:myblahpassword
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = may
header_size_limit = 4096000
relayhost = smtp-relay.sendinblue.com:587