Hi
I use keepalived and easy check like:

vrrp_script chk_myscript {
    script     "/usr/bin/postfix-check.sh"
    interval    4
    fall        2
    weight      10
    user root
}

...
#!/bin/bash
echo "ehlo localhost" | /bin/nc -w 1 "127.0.0.1" 25 |grep -q "250"
...

It's not very pretty but do you have any similar solutions?
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