I'm getting this error in my Exchange 2003 Server:
"Event Type: Error
Event Source: MSExchangeTransport
Event Category: SMTP Protocol
Event ID: 7010
This is an SMTP protocol log for virtual server ID 1, connection #65. The client at "x.x.x.x" sent a "helo" command, and the SMTP server responded with "501 5.5.4 Invalid Address ". The full command sent was "helo (null)". This will probably cause the connection to fail.
I know this is a problem with the check_smtp that does not send the hostname after the helo string.
There is no option/switch in the plugin to do this and I've already tried to send a "check_smtp -H xxx.xxx.xxx.xxx -C "helo server" -v" with no success...
Thank you very much.