“GrayMail” sounds like either some shriveled up husk of an email message, or the undead ghost of messages coming back to haunt me. Both concepts are not far off the mark.
Spam is easy to define – mail that you do not want and have never asked to receive.
GrayMail is legitimate bulk mail that was requested by you in the past (even if you don’t remember doing so), but which you no longer want. Graymail is generally not considered spam, yet
it represents a significant nuisance and often the unsubscribe options provided fail to work (or you may not want to use “unsubscribe” as you are afraid of inviting more unwanted email).
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