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Re:Own-Mailbox, the first 100% confidential mailbox by Nadya on Monday June 29, 2015 @12:03PM (#9798920)
They mean if you send mail to anyone else - their spam filter will block you for having a residential IP.

Email is a bit less useful when everyone has you auto-blocked for being 'spam'.

Re:Own-Mailbox, the first 100% confidential mailbox by sp332 on Monday June 29, 2015 @12:25PM (#9799068)
I'd forgotten about that part. Yes, having an IP from a pool marked as "dynamic" is enough to get put on many spam blacklists.