Actually, Marketo is supporting emojis from unicode 5.2 and previous. This blogpost here shows them... You can copy paste them in your subject lines, sender name fiels and in your tokens... and test, test, test !
That's not actually how it's done. Only a limited number of emojis work via direct copy-paste. You should read my (earlier, more complete) blog post linked above.
Hello Sanford,
Well, I dit it... Actually, I was so enthusiastic when I read it few weeks ago. I tested it and everything was fine ! But some times after, It was not working anymore... I made other tests and I found that you can copy paste emojis from unicode 5.2 and previous. Sometimes they are not well displayed by Marketo, but it manages them.