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Twitter: @emailsecgeek or @fmisle
No, you cannot guest-post.
No, I will not promote your infographic for you.
No, I will not link to your [insert whatever you think is awesome here].
No, phrases like "I just wanted to bump this to the top of your inbox" and "maybe you didn't receive my earlier email" will not increase the likelihood of me responding - in fact, they guarantee you the opposite!