Never remove ability to block designated emails as spam and for ever block sender
Deleting is worse less if senders can not be designated as spam an for ever blocked from ones account. Why did you delete spam designation from the drop down window. Are you getting a cut on the take of the spammers stealing your customers identities?
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Are these legit junk emails or newsletter/promotional type emails from stores, etc? Big difference. For legit spammy emails, please "mark as spam" instead of deleting. For other coupon/promotional type emails like from stores, unsubscribe, at one point (even if you don't remember) you subscribed to these emails. Hope this helps!