Anyway, I needed to find a new email marketing service and chose AWeber, a market leader. On importing my list to AWeber, it insisted on a double opt-in since it had not been mailed for 6 months+. I lost almost 240 subscribers in one fell swoop (ie, a large percentage of my list). My following email campaign to the mailing list decimated through Weber's policy was a failure. AWeber charged me almost $320 USD per annum for the privilege.
Yes, I know, with a list not serviced for 6 months, there might have been some complaints. There were none. Yes, I lost 80 in Unsubscribes, but nowhere near the 240 that I lost through AWeber's mandatory double opt-in.
I took my complete list to MailChimp. It allowed me to design a beautiful HTML newsletter and mail the complete list of 800 with no double opt-in. My first MailChimp campaign last weekend netted me over £3000 GBP.
For this service, MailChimp charges... wait for it... nothing.