Heavy CPU usage during peak and port 25 connection timeout
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Can heavy CPU usage during peak load times cause problems with email reception, to the point where emails are “not handled” because port 25 is unreachable from outside the network, bringing to “25: Connection timed out” and to Undelivered Mail Returned to Sender.
I'm asking this question because I've had a similar problem and I'd like to know how to mitigate it.
I've already limited maximum CPU usage to 80% of every single app hosted on Cloudron, but I'd like to understand how the overall load is being managed, to the point where 25 port stops responding.
No any log on Cloudron (Server, Mail) about ”not handled” email.
Edit: allocated Ram show that every app and service has enough Ram. My question also is: there is a way to assign maximum CPU usage to each service, to “keep alive” essential one?
Edit2: Peak was caused from an high number of web pages served and a lot of incoming email received in very short time, like a time frame of 10-15 minutes.
Thanks a lot
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