I have been using ISPconfig for couple of months now.. It is working great.. But recently, I have come to notice that it sometimes take very long time to retrive emails from external accounts. I have installed ISPconfig3 on Debian 8 and as per the system log run-getmai.sh is running every 5 mins. There are no errors in mail-logs too. But it oddly takes very long time to retrive emails. Initially I thought that might be issue with one specific email account but as I have noticed recently thats not the case. I am not sure why getmail won't retrieve messages when it is running smoothly every other 5 min.