Email Marketing Software that Doesn't Need Double Opt-in via API
I'm now using Aweber but the problem is that they don't allow switch off double opt-in (compulsory subscription conformation) when you are not using their form but using API to add subscribers from 3rd party websites and applications
This is actually a very bad thing because I'm wasting my traffic - only around 40% of all subscribers DO confirm their emails - so I'm wasting 60% of my traffic

So do you guys know any Email Marketing tool that doesn't need a verification when used remotely via API?
Any suggestions are welcome
Thanks!
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