or can we have a particular code to write in the html that can affect the subject line?
such as in the style ?
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Possible duplicate of [Animated icon in email subject](http://stackoverflow.com/questions/28095387/animated-icon-in-email-subject) – Mar 17 '16 at 11:33
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You cannot put an animated gif in the subject line, however, some email clients (iPhone, Android) will render some unicode entities as images.
This site has a listing of some - http://ecommerce-blog.nexternal.com/%E2%98%85-use-symbols-in-your-email-subject-lines-to-get-noticed-%E2%98%85/
However, you certainly will want to test this in many email clients to insure against adverse effects.
samanthasquared
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Doubt it - but it ultimately depends on the email client implementation as HTML email doesn't seem to be well defined/standardized.
Based on sections 3.6.5, and 2.2.1 of RFC 2822, the subject line is:
referred to as [an] unstructured field body. Semantically, unstructured field bodies are simply to be treated as a single line of characters with no further processing.
The message body (section 2.3), on the other hand, supports other MIME types:
[RFC2045, RFC2046, RFC2048, RFC2049] that extend this standard to allow for different sorts of message bodies.
