There are 4 ways to add a signature to your campaigns:
Using manual variables
{{sendingAccountName}} - the full name of the sending account
{{sendingAccountFirstName}} - the First name of the sending account
{{sendingAccountEmail}} - the current email account being used to send the campaign
These are special variables that you will have to write down manually in the campaign editor.
It essentially takes the value from the sending account's name, whatever value is set in the account's settings section. As the sending email accounts are rotated, their specific settings values are used.
Using signature variable
The signatures for your sending accounts can be configured from the account settings. Edit the signature in accounts settings, and then import it into your email with the variable {{accountSignature}}.
Here are the following steps:
Go to Accounts dashboard, and open the account settings of the email account.
Here you will find the signature editor. You can add images and link when you create signature in account settings.
To insert a signature into the email copy, go to your campaign sequence editor, and click on the Variable button:
Then, select the Signature variable. This variable will import the signature for every sending account you have connected to that campaign.
Using an image
If you want to add an image as your signature, please check this article for a step-by-step guide: How to add images
Using HTML
To add HTML signatures, you will need to click on the code view and add the HTML code there. You can use some of the online signature generators to get the HTML code, and then paste it to the Sequence editor's "Code View".
Note: Enabling "Delivery Optimization" will affect the appearance of the HTML and Image option, as it strips all HTML formatting and images in the email copy with the aim of improving deliverability.