SASL SSL Email not working

Anyone had issues where they cannot test send smtp on 465 (or IMAP on 993), and get this error in a Postfix / Dovcot world? I can send on 25 and receive on 143, but don’t want to.

Anyone know how to fix this? All other email to the mail server, from users both inside and outside the firewall work just fine, and have no SASL issues. We use dovecot SASL, and all mechanisms are specified where needed.

Jan 30 08:18:24 mail-server postfix/smtps/smtpd[8570]: warning: unknown[XX.XX.XX.XXX]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 08:18:24 mail-server postfix/smtps/smtpd[8570]: NOQUEUE: reject: RCPT from unknown[XX.XX.XX.XXX]: 554 5.7.1 <unknown[XX.XX.XX.XXX]>: Client host rejected: Access denied; from=mike@test.com to=mike@test.com proto=ESMTP helo=<XX.XX.XX.XXX>