Relevant Products: Exclaimer Cloud - Signatures for Office 365 | Exclaimer Cloud - Signatures for G-Suite | G-Suite Lite
The signature template is using a custom font stack, such as: Calibri, Candara, Segoe, Segoe UI, Optima, Arial, sans-serif;
However when the signature has been received in Outlook, the fonts have turned to Times New Roman, or a similar serif font.
Outlook adds in single quotation marks to the first font in the list, causing this issue to occur. This can be found in the source code of the email itself.
Adding double quotation marks around the first font in the stack will override the marks added by Outlook, and force the fonts to remain as a sans-serif font.
As an example, the font stack will look like: "Calibri", Candara, Segoe, Segoe UI, Optima, Arial, sans-serif