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Yup the mail flow is very ok now, fyi the current mailbox of my zcs single server is about 1037 mailboxes, with 8 core processor and 32 G of RAM, is the mailbox too much? or there might be parameter that I can adjust so that my zcs can provide good services to 1037 mailboxes? thanks.zimico wrote:Your system parameters seem to be normal. Is mail flow ok now?
Best regards,
Minh.
How to identify that? I believe it only can be done when it's happening, or maybe any way to identify SMTP attack after?zimico wrote:it depends on mail usage of our users. single server with about 1000 mailbox is not too big.
Note that if you started with small server and have added RAM later, you must reconfig innodb_buffer_pool_size and java_heap, please refer to
https://imanudin.net/2019/05/16/zimbra- ... ading-ram/
https://wiki.zimbra.com/wiki/Performanc ... eployments
In my experience, maybe sometime you are under SMTP attack so it will eat your zimbra resource while CPU and RAM is normal.
Best regards,
Minh.
Code: Select all
# cat /var/log/zimbra.log | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'| sort | uniq -c | sort -nr
# netstat -np --protocol=inet | grep ESTABLISHED | grep :smtpd