I wish to send emoji in email subject line, it is possible when in edit templetes, you can do a send preview message and it works, but when you leave a voicemail in a users mailbox it just send the plane text. this is the code for the subject line β=?utf-8?Q?=f0=9f=93=a8New=20Voicemail=20Message!=20=f0=9f=93=a8?=β with out quotes.
I suspect the send preview email is sent by root user but not sure.
send preview
voicemail box send email