Sorry for not viewing this support forum before your blog :)
I've an error 250, and here's the message:
"Latest mailing list activity: Problem adding ('firstname.lastname@example.org') to list ee28f4e7a2. Error Code: 250, Message: EMAIL must be provided - An email address must contain a single @, Data: Array ( [FNAME] => test [LNAME] => [EMAIL] => test )
But as you can see, email is provided and contains @.
Automatic sync doesn't work too, it's supposed because of the same problem.
Is a bug?
Thanks in advance.