postfix-users October 2011 archive
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postfix-users: Re: postscreen: 550 5.5.1 Protocol error

Re: postscreen: 550 5.5.1 Protocol error

From: Wietse Venema <wietse_at_nospam>
Date: Tue Oct 18 2011 - 13:47:07 GMT
To: Postfix users <postfix-users@postfix.org>

Jeetu:
> Hi,
>
> Im using postfix 2.8.5 with postscreen.
> Im constantly getting this error message
>
> Oct 18 08:02:10 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
> RCPT from [x.x.x.x]:64730: 550 5.5.1 Protocol error;
> from=<newsletter@greetings.info>, to=<preethindkr@mail.in>, proto=SMTP,
> helo=<greetings.info>

The mail client makes errors in the SMTP protocol.

Grep the logfile for the client IP address, and it will show you
what kind of protocol error the client was making.

        Wietse