I've been analyzing bounces for one of the brands of the company I work for, because we're having a reputation issue on the dedicated IP we're sending from. I've noticed that almost all of the hard bounces are being caused by addresses on just a few domains: yahoo.com, aol.com and comcast.net. But even weirder is that almost all of those addresses were subscribed just a few days ago. It almost seems like someone, or something, is subscribing non-existent email addresses to our list.
Since the subscribe form is just the email address, I think we'll implement reCaptcha and see what that does first of all. I'll also take a look at the IP(s) subscribing these addresses to see where these addresses are coming from. But I don't get what is happening, and why. At first I thought it was just people making typos, but our brand is a UK brand, so I'd consider it very strange that what then probably are US visitors making all of these typos.
Has anyone seen similar behavior? Do you have any tips?
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source https://www.reddit.com/r/Emailmarketing/comments/ev46w9/someonesomething_is_subscribing_nonexistent_email/
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