There are a few hosts which ocasionally throw errors like these:
1286:Mar 17 15:01:08 Server postfix/smtpd[1324]: connect from
mail-ob0-f169.google.com <http://mail-ob0-f169.google.com>[209.
85.214.169]
1287:Mar 17 15:01:09 Server postfix/smtpd[1324]: Anonymous TLS
connection established from mail-ob0-f169.google.com
<http://mail-ob0-f169.google.com>[209.85.214.169]: TLSv1 with cipher
ECDHE-RSA-RC4-SHA (128/128 bits)
1291:Mar 17 15:01:10 Server postfix/smtpd[1324]: 69A87280008:
client=mail-ob0-f169.google.com
<http://mail-ob0-f169.google.com>[209.85.214.169]
1301:Mar 17 15:01:15 Server postfix/smtpd[1324]: disconnect from
mail-ob0-f169.google.com <http://mail-ob0-f169.google.com>[209.85.214.169]
1313:Mar 17 15:02:20 Server postfix/smtpd[1324]: connect from
unknown[113.11.251.194]
1314:Mar 17 15:02:21 Server postfix/smtpd[1324]: Anonymous TLS
connection established from unknown[113.11.251.194]: TLSv1.2 with cipher
ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
1315:Mar 17 15:02:22 Server postfix/smtpd[1324]: warning: unknown smtpd
restriction: "????"
1316:Mar 17 15:02:22 Server postfix/smtpd[1324]: NOQUEUE: reject: RCPT
from unknown[113.11.251.194]: 451 4.3.5 Server configuration error;
from=<> to=<u...@mydomain.com <mailto:u...@mydomain.com>> proto=ESMTP
helo=<vps.enggsol.com <http://vps.enggsol.com>>
Postfix reloads do not throw any errors so it's not a syntax problem
within the config files. Checked the different restriction files too -
nothing suspicious. Any clues what might be throwing these four
exclamation marks?
