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Yesterday, I moved a new domain to my SmarterMail server. The users are using Outlook to connect through IMAP just like they were with their previous email host. The client is complaining that it is slow for all their users through Outlook but fast through his phone. If he closes Outlook and re-opens it, then the email he was expecting appears.
I set up Outlook against one of the accounts and was receiving messages within 3 minutes.
My server looks great performance-wise for CPU (hovers around 20%), RAM (4GB free out of 12GB), Plenty of space on SSDs, NIC utilization is low, bandwidth isn't an issue. None of the accounts is larger than 1GB. The number of connections is right where you'd expect it, currently 29 IMAP.
Any advice on what to tell the client to try or changes to SmarterMail config I should try?
Owner of Efficion Consulting