I wish I had a better description for this problem, but suddenly I've been receiving a heck of a lot of mail delivery sub system errors apparently where invalid commands are being generated, to firstname.lastname@example.org from the domain owner account.
I'm trying to figure out in the first place what is triggering these errors, and interestingly enough, in these messages a "support ticket not opened" shows up , along with a 1and1.com mx server as part of the communication, with the email@example.com being part of the address.
I'm trying to figure out what's going on, as to why I'm getting these, and what does this indicate?
A compromised server?
If so, it shouldn't be on the network whatsoever, that is online at all.
Does this mean that somehow my server has been an open relay?
Or can I get rid of problems like this.
It seems ever sinse the day I put out the firstname.lastname@example.org alias, my domain owner inbox (and note I did not say spam folder) has been receiving plenty of likely spam messages, that spam filters are permitting happily for some reason, despite sain spf configurations with sender restrictions.
These mail delivery reports, wich just started a few days ago, are the latest issues I'm now experiencing.
If anyone can give me ideas, let me know.I've stayed updated on all Virtualmin software, however.
CentOS 6.3 is installed, and all that good stuff.
Thanks for any ideas on as to why I'm getting this stuff, how I might be able to redirect some of this junk off to good old /dev/null if possible, etc.
Any advice as to what's going on is appreciated.
If someone could do a remote scan of keithnet.us to see if you can successfully perform open relay commands though I don't know why you should be able to as I haven't touched anything in postfix that would allow this, I'd appreciate it.
But if my server is sending out emails at random regardless of delivery reports being successfully generated, I'm wondering what's going on, and this has alarm bells ringing in my head from an email server standpoint unless you email server folks say otherwise.
Loads of mail delivery subsystem errors in my main inbox