Recently I opened my server's webmaster email inbox and found 32 "Delivery status notification failed" emails reporting the failure of the delivery of 32 emails I did not send.
After some investigation I have determined that several IP addresses are attempting to impersonate my web server by sending emails from random email addresses (that don't exist) using their own mail servers.
I have a tight SPF record set:
v=spf1 a mx ptr ip4:220.127.116.11 ip6:2001:41d0:52:a00::68e a:starbeamrainbowlabs.com a:mail.starbeamrainbowlabs.com -all
My Question: Do these spammers attempting to impersonate my mail server impact my mail server's reputation? Will I get added to some blacklists and then be unable to send emails to certain domains?