I had the same problem. A Google search turned up this link: http://hkitago.com/2014/09/yosemiteのpostfix設定/
It turned out I was missing the following line in /etc/postfix/main.cf:
smtp_sasl_mechanism_filter = plain
I had the same problem. A Google search turned up this link: http://hkitago.com/2014/09/yosemiteのpostfix設定/
It turned out I was missing the following line in /etc/postfix/main.cf:
smtp_sasl_mechanism_filter = plain