esh + mx   2

G Suite Toolbox: Check MX
Tool to review MX DNS entries for a domain
email  dns  mx  tools  esh-anvilon 
april 2017 by esh
Configuring Postfix to act as a backup MX server | Samat Jain's personal home page
The one time I tried letting a second server do MX backup, a ton of spam got sent through that second server that avoided some of the checks on the primary server, but if I ever want to try it again, here are some handy notes
postfix  sysadmin  mx  failover  linux 
june 2006 by esh

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