When using AUTH, postfix adds AUTH=<> to the envelope sender. This causes a CrossBox server to reject the message:
220 CrossBox SMTP Proxify # 232 (1) Fri, 04 Jan 2019 08:13:35 +0000
EHLO example.com
250-Hello example.com[x.x.x.x]
250-PIPELINING
250-8BITMIME
250-STARTTLS
250 AUTH LOGIN PLAIN
AUTH LOGIN
[digest sent]
X.235 Authentication successful
MAIL FROM:<[email protected]> AUTH=<>
501 Was expecting MAIL arg syntax of FROM:<address>
If I telnet to the CrossBox server and omit the AUTH=<> it works OK.
The CrossBox server is outside my control. Is there a way I can adjust the postfix settings to still authenticate but prevent AUTH=<> being appended?
Currently
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_use_tls=no
(smtp_use_tls=no for testing purposes, so I can tcpdump the interaction)
0 Answers