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Old 1st February 2013, 20:25
chrisg chrisg is offline
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Exclamation Postfix - 500 Syntax Error

I have set up a postfix server in front of Exchange.

Things seem to have been running fine then lately I got a report from two different domains that are rejecting emails from us.

This is the message from the bounced emails: host mini.tetherinc.com[67.1xx.1xx.xx] said: 500 Syntax
error, command unrecognized (in reply to DATA command)

So I ssh'd into my postfix server and tried a manual telnet e-mail. This is what happens:

root@antispam:~# telnet 67.1xx.1xx.xx 25
Trying 67.1xx.1xx.xx...
Connected to 67.1xx.1xx.xx.
Escape character is '^]'.
220 mini.tetherinc.com ESMTP Service ready
HELO antispam.appart.com
250 Requested mail action okay, completed
mail from: emailaddress@domain.com
250 Requested mail action okay, completed
rcpt to: emailaddress2@domain.com
250 Requested mail action okay, completed
500 Syntax error, command unrecognized

Any ideas on what could possibly be causing this? It is only two domains that have shown this error but they are very important domains that we need to be able to e-mail with no problems. Please help!!
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