The ability to create multiple domains, send test emails from a variety of different clients (both web browsers and desktop programs). It's easy to use with an interface that makes it understandable regardless of your level of technical knowledge or experience. I do not have any complaints about this product as far as functionality goes. There are other products out there which offer more features at lower prices but if you're looking for ease of use this one should be right up top in regards to choosing between them. We used emaillabs to help us develop our own software toolbox so we could easily send mass marketing campaigns.
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