Hi,
I wasn't really sure where to ask this, but as a potential feature request, I think it would be a good idea to develop a round trip email round trip sensor based on MX records.
The issue with SMTP round trip is that your basing this on one single SMTP server, with the MX record you will be able to do the round trip based on your MX record lookup servers. This would be good to meet certain KPI's with-in our business. (If you restart the SMTP server the round trip is based on, your KPI wouldn't be accurate; if this was set based on MX records, the system would simply use a secondary server and still measure 100% uptime in this case)
Thanks, Mark
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