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Hi
You can indeed use Unicode in a hexadecimal form of the emoji within the Subject line to achieve your request, but some initial testing will be required.
When inserting EMOJIs into a subject line, you must use the base string formatting like =?UTF-8?Q?=
Search the hexadecimal code of the emoji you want to insert (for example F0 9F 98 81 (you must remove \x) on the website http://apps.timwhitlock.info/emoji/tables/unicode)
Add the hexadecimal code in the base string format like the following:
=?UTF-8?Q?=F0=9F=98=81?=
You can paste this directly on your delivery subject. The character won't be visible until you send the proofs but will be functional.
Regards,
Vipul