I am new to iRedMail and I have small issue with my server and hope you can help. After I configured domain and mailboxes everything seem working, but sometimes outgoing mail go to queue and delay for few minutes before delivery. I check logs but I not sure what exactly cause the delay. I read some guides about performance and queue settings, but I not find clear answer why sometimes slow. I do some mep estimates for my server capacity settings (like CPU, memory, and expected message load), but maybe I miss some setting inside iRedMail that control mail queue speed? Can someone share idea what parameters to check for mail queue delay? Maybe related to DNS reverse lookup or too strict policy? I use Postfix with iRedMail defaults. Thank you for help!