Problems setting up SMTP health checks with Sophos email gateway (2 replies)

I have a very simple configuration that I've setup to handle load balancing with my Sophos email gateway.

listen smtp_relay
bind IP:25
mode tcp
option smtpchk EHLO domain.com
balance roundrobin
server SMTPGATEWAY IP:25 check
server ALTERNATEGATEWAY IP:25 backup check

According to the logs on the Sophos appliance the health checks are sending in this format

EHLO domain.com\r\n

Which throws an error "501 Syntactically invalid EHLO argument(s)"

If I telnet to the host, and manually use EHLO domain.com it works fine, but if I do EHLO domain.com\r\n it reproduces the error.

I also tested on my Postfix and Exchange servers, and they seem to handle the \r\n just fine, but the Email gateway freaks out. I've sent a ticket in to them as well, but I was wondering if there was a way that I'm not seeing in documentation to surpress the \r\n in the health check without writing a custom check.

Thanks!

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