what is this junk?

[Zion Ahead]

I'm getting all sorts of strange (appears to be spam) "mail error" messages in so many various phrases. They are all coming to my same email address at me@mydomain.com which has a 8 SA score

Some examples attached. This is driving me crazy

I have a clean domain setup according to dnsreport.com (including proper SPF records)

[Lyttek]

#1 and #2 Looks like your return address is listed in emails by a spammer... not much to do about it.

#3 and #4 Because your address is listed as the reply-to, and two accounts to which the spam was sent were full, you get the message that the accounts are over quota... again, nothing you can do.