Email clients behave differently than web browsers. When you look at your email via Preview you are looking at it via a browser. When you send it out you look at via an email client Outlook, Gmail etc. They treat things differently than browsers in some instances. The safest course of action is to have a small list of email addreses for each of the major email clients. Send your email live and look at it through each of the email clients. Differences are inevitable!!! The decision is whether or not the differences are acceptable, BTW other email marketing software have the same issue.
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