I an across this error now, and none of the solutions helped that I searched on the web, it turned out I had to add a line for my static ip on my subnet instead of just 127.0.0.1 in my /etc/hosts
Before:
127.0.0.1 localhost myhostname
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
After:
127.0.0.1 localhost myhostname
192.168.0.221 myhostname
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
Using "sudo ngrep -d any port 25" helped me determine this error.
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