Blocking email that spoof your email address as sender

Everything is going well with my installation, except one nagging issue. Is there a way to configure to prevent email that is spoofing my own email address as the sender/return address. I have attempted to block sender, but it appears that you can’t block your own email address. Any ideas?

I noticed same issue. Header reports look like
my ip[spammers ip]
with actual source IP in brackets following address.
Anyway to force a check?

I have had this problem on my computer three different times, the little spammers are busy. Only thing I have been able to do is delete them. I generated a ticket on this issue a while ago at least a month ago and to date have not gotten a response.

Have the rest of you filed tickets with Support? I’d like to make sure they’re aware it’s not an isolated incident…