How to add the word <ADV> in the subject title?

[FirstNameL10623]

Hi All,

As above, I added the word <ADV> in the email subject title, but when I sent the test mail out, there was no such word <ADV> 

So I'd like to know if is there any solution to add the word <ADV> and make sure these words will show up also.

Thanks!

[FirstNameL10623]

Hello @FirstNameL10623 ,

Tagging like that isn't possible for subject lines via the email editors. 

[William_A]

Hello @FirstNameL10623 ,

Tagging like that isn't possible for subject lines via the email editors.