In Online Marketing, eMail Newsletter Campaigns plays a major role to reach maximum number of audience. eMail Newsletter is one of the easiest ways to market your products, events, offers etc. Your eMail Newsletter Design might look great in one eMail client, but chances are when you open the same eMail in a different eMail client the results may not be the same.
To be sure that the eMail Newsletter is reaching to the end users properly without any formatting issue(s) and getting displayed properly to the end users, follow the below guidelines.
HTML Code Validation: Normally the eMail Newsletters are in HTML format, and should be validated properly before final send-out, there should not be any missing tags or extra tags. You can use W3C Validator to validate your pages.
Learn more about Guidelines for eMail Newsletters