I've got a small mailserver in my house i use for my personal email. I'm now being inundated with replies from mail servers worldwide that the address isn't valid, full etc. I've looked in to my network using wireshark to see if somewhere in the network I've been infected and a rouge server/pc is sending to the SMTP server, but I see tons of external source IPs with replies from my server back to them.
I'm assuming as wireshark hasn't shown the spam originating from inside my network that it is backscatter spam, i.e. spoofed headers using my email address which then bounces back if the server doesn't have a valid address or other issues with the server. How long does this normally go on for? I'm receiving 10s of thousands of NDRs and replies from servers across the world (including some funny replies).
Any thoughts are appreciated.
I'm assuming as wireshark hasn't shown the spam originating from inside my network that it is backscatter spam, i.e. spoofed headers using my email address which then bounces back if the server doesn't have a valid address or other issues with the server. How long does this normally go on for? I'm receiving 10s of thousands of NDRs and replies from servers across the world (including some funny replies).
Any thoughts are appreciated.
