Thanks for bringing that subject up! Having you used both of these services in the past 2 years, I prefer Aweber over Mailchimp. For me it comes down to usability and efficiency, which Aweber just does better than Mailchimp. Having said that, I do like the value Mailchimp brings to the table for new startups with their free service. Also I do admit that giving away 2,000 subscribers to everyone – that’s just huge, yet clever at the same time.
As with most ESPs, you’ll need to certify that any list you upload is permission-based and conforms with the provider’s anti-spam policies. AWeber takes this a step farther than some. You will need to enter the source of the email list when you upload it, and AWeber requires confirmed opt-in for all addresses. This means your first email will have to be a request for your subscribers to confirm their subscriptions. Anyone who doesn’t confirm can’t be on your list. (AWeber does allow some exceptions to this rule if you have a list that has already gone through confirmed opt-in with another ESP.)
Now, you can automatically send highly relevant emails encouraging them to buy the product or service they were considering. Customers who received multiple abandoned shopping cart emails are 2.4 times more likely to complete the purchase than those who receive only one followup email, according to Experian. Try sending the first message one day after, a second message 48 hours after, and possibly a third message within three or four days of abandonment.