I went through the exact experience with Opera a couple of years ago- being blocked as a spammer and my email account suddenly rendered entirely useless. I developed my own domain in the time since, though for cost factors had switched to lavabit earlier this year. I loved the cleanliness of their system, but as I type I have been unable to access my account there since yesterday. I can seek out no explanations, as their comment box leads only to an error system stating the Apache server is evidently down. Completely frustrating, particularly as I have multiple business dealings that are in progress and very time-sensitive. So, my own quest for the perfect email continues...