I’m also having this issue, ALO EasyMail Newsletter Widgets says:
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Error during sending: please try again.
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My last subscription was dated 3 days ago (June 24, 2012) I didn’t update the plugin so I don’t know what happen.
Note that I’m using ALO EasyMail Newsletter Version 2.4.3 and here is our website in case you want to test it: https://www.hearttoheartthoughts.com/ (The part that says Newsletter Sign Up is the problem)
Please help me, thanks in advance.