Who is postmaster that spamming

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So it came from outside our network. I tried doing a SPF awhile back, and I thought it was setup right. Yesterday I tried a spam test from mail-tester. Edited Mar 9, at UTC. Comodo Antispam Gateway Should I enable this option? Should I do this? I temporarily routed our mail traffic out thru the smarthost, just to watch the behavior. I tested emails and they worked. What do you think? Probably disable backscatter for a few days like it says in their guide?

Should I use the Exchange Antispam link I posted? Was it the same campaign as before with the wnccumc. It might be that some servers have had the message in a retrying state temporary errors and are finally timing out and rejecting. I'm not sure how MXLogic does their backscatter filters, but it could be smart enough to know that the bounce is from before it was enabled and allowing the message through. If that's the case, the filters I mentioned above null senders, postmaster, mailer-daemon should handle the huge majority of them.

I use Office for email with about 30 people using 6 domains. For instance: I assumed that one of the following was happening. Someone was sending messages to me pretending to be the Postmaster.

Someone was sending messages to others with forged headers so that it looked like it was coming from me. Here are my questions: Is there any way to tell whether these messages are legitimately from postmaster?

If so, would I be able to completely block any messages not from the legit postmaster? Is there any way of guarding against someone forging headers to send email on one of my domains? More Information I am receiving these suspicious emails on my main admin account let's say that is one domain1.

Normally, a bounced email message from office looks like this: Which leads me to think that this is a fake message. Improve this question. Community Bot 1. William William 9 9 silver badges 25 25 bronze badges. Add a comment. Active Oldest Votes. Look at the message headers to determine where a message really came from.

MessageIDs from Exchange are pretty easy to pick out. Edit: Line 24 in the header shows how Exchange evaluated the spam posture of the message.

Pulliam pul Spam from "postmaster"? Reply to author. Report message as abuse. Show original message. Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. I've recently got a few "undeliverable mail" messages from "postmaster" at MSN or Hotmail. They are usually spam type of subjects that are in the returned messages.

Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. According to Gmail, using these tools can determine the health of your email program. Note There a minimum daily email volume threshold for data to populate in the Google Postmaster Tools.

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