Two days ago we migrated a customer’s Zimbra mailserver to a SSD VPS of our beloved Contabo hosting.
I do love Contabo: they offer big VPSes for an extreme challenging price. They’re really uncomparable.
While I wasn’t in charge of the migration I couldn’t refrain to tail zimbra.log to see how/when mail was flowing throug, and I immediately spotted some Connection refused errors for different hosts, even our own mailserver still on a Contabo VPS.
While quite worring I let the balls stop before raising an alert.
The day after the migration there were still Connection refused errors in mail log: time to investigate.Continua a leggere