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What types of files can be sent as part of self-contained (Content-ID) HTML mail?

April 26, 2017content-id files html mail self-contained sent types

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What types of files can be sent as part of self-contained (Content-ID) HTML mail?

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The Content-ID support in CustomMailer will handle any SRC subtags appearing in any HTML tag. This includes IMG for images (e.g. .gif, .jpg), SOUND and BGSOUND for sounds (e.g. .wav, .au, .mid), and EMBED which can support a variety of data file types intended to be run by plug-ins including sounds, movies (e.g. .mov, .avi, .mpeg), animations (.swf), Adobe Acrobat (.pdf) files, etc.