Depends how many servers you are looking at and how good the IDS is on the site. If it was enough of a problem, I could see using that fingerprint to tag a site to watch behavior more closely. ISTR discussions about this many years ago on SPAM-L. Perhaps browsing the archives for doorknocking, testing addresses, and some similar search terms might be useful.

--MidLifeXis

In reply to Re^7: Determine if domain is actually used for email by MidLifeXis
in thread Determine if domain is actually used for email by vit

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