Topic: Abnormal upload bandwidth usage
I have iRedmail Pro 4.3 installed on Ubuntu 18.04 installed with the downloadable installer using MySQL on apache. Shortly after replacing my previous mail platform I noticed that my upload bandwidth was abnormal and traced it down to the new mail server. The total mail I have between my 3 domains is 25.48 GB. Typical usage is under 50 sent messages a day and under 200 received. However, my server uploads over 10 gb a day. I'll often see the spike in my traffic log max out my WAN upload speed for up to 20 minutes at a time. I started capturing the traffic and found that the IP addresses receiving the bandwidth match the few offices that download mail from me as well as addresses that belong to mobile networks. I never saw such bandwidth spikes on my previous platform I used and I hosted the same domains and mail. I fail to understand why half the total size of the entire mailboxes would be transmitted every day. Where would I start pinpointing what is using so much data?