All kinds of symbols (emoji, emoticons, symbols, and special characters) can be inserted into the subject line.
You can find a selection of symbols here:
Emojis
Dingbat
Miscellaneous Symbols
Step 1
Insert the symbol as an entity. [Example: the entity that corresponds to the dingbat “BLACK SCISSORS” is: ✂]
Many symbols can also be inserted via copy and paste.
Step 2
Symbols in the subject line are possible in principle and recommended in some instances to arouse the recipient’s curiosity and encourage them to open the email. However, a healthy measure of restraint should be practiced to ensure the effect doesn’t wear off.
In order for the symbol to be displayed correctly, the mailing’s source code communicates a number and a font to the enduser device. The end user device then selects the symbol with the specified number from the fonts installed on the recipient’s computer. Problems arise when the font is not available on the computer or smartphone, or when it cannot be found under the predefined number entry. In such cases, a black box, a question mark, or a space is displayed instead of the symbol.
It is therefore recommended to test the mailing in all relevant email clients (i.e., the ones most frequently used by your readers) before dispatch. Today, symbols in the subject line do not negatively affect the spam filter. You should not overdo it, however. It cannot be ruled out that too many symbols will be rated, like too many question or exclamation marks.
With our tool for licensing, the inbox preview, you can see the various depictions of your mails, including the subject line. The Inbox Preview tab in your email’s editing view provides you with 3 free previews. If you require an unlimited number of previews, please contact our support team via ticket.