Hello @SusanR6 ,
Image files cannot be added to subject lines, there wouldn't be a way to include your company logo in the subject line. If you're looking to add emojis to your subject line, I'd advise following along with this article- also available via your Help tab.
See also:
Best practices for using emoji in an email subject line
Optimize the subject line of an email
Subject line personalization
If your question is about including your company logo as the email avatar / profile picture that people see in the inboxes alongside the email, that would be dependent on a couple settings:
What is set in the receiving address's contacts / address book for the sending address, similar to how you can set custom photos for phone contacts on your phone.
What you have set for your address's profile pic via the system where your domain is hosted. Similar to how free email program users can set their own profile pics for their overall account, whatever program you use for your sending address would dictate the profile pic it tries to include.
Keep in mind that this is a moot point if you're using the ccsend rewrite, and only applies if you're using your own email address by self-authenticating.
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