Hi.
When relaying to an external service, I set a specific token in the mail header
to pass authentication.
I am able to send mails by adding the smtp_header_checks option to smtp in the
master.cf file.
However, it appears in /var/log/maillog.
Is there any way to avoid this?
[root@xxx-mail01 ~]# grep X-TEST-Token /var/log/maillog | more
Dec 15 03:08:16 xxx-mail01 postfix/smtp[4717]: D7B83C0646: prepend: header
From: =?ISO-2022-JP?B?GyRCJSglIiVIJWobKEI=?= <reservation@ai: X-TEST-Token:
YWlydHJpcCB0ZXN0IHRva2Vu
Dec 15 03:08:17 xxx-mail01 postfix/smtp[4719]: DF72FC093E: prepend: header
From: =?ISO-2022-JP?B?GyRCJSglIiVIJWobKEI=?= <reservation@ai: X-TEST-Token:
YWlydHJpcCB0ZXN0IHRva2Vu
[root@xxx-mail01 ~]# grep "^relayhost" /etc/postfix/main.cf
relayhost=relay.xxxx.com
[root@xxx-mail01 ~]# grep -B 1 smtp_header_checks /etc/postfix/master.cf
smtp unix - - n - - smtp
-o smtp_header_checks=regexp:/etc/postfix/smx_header_add
[root@xxx-mail01 ~]# cat /etc/postfix/smx_header_add
/^From:/i PREPEND X-TEST-Token: YWlydHJpcCB0ZXN0IHRva2Vu
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