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Email Deliverability & Bounce Codes

Question asked by Nancy Lawson Beech on Mar 26, 2018
Latest reply on Mar 26, 2018 by Sanford Whiteman

I've created a directory of lead bouncing emails and added in all bounce codes. I'm baffled by Category 9 Soft Bounces (bounces that are unknown, undetermined or gibberish details. Delivery isn’t reattempted). I would think 100% of these emails would be invalid. I ran them through and 84% are valid emails. Marketo says, "This case is special, as you mentioned if some of the emails are valid the servers where the email is sent to could be set up as the category two to return an error, in this case the admin of the servers can set up to send back a customized error in which would not allow the leads to qualify for the other bounce categories and therefore being put into this category. " Wouldn't they then be considered Category 1 hard bounces? Or is the problem with QuickEmailVerification?