Using Calibri Font as your Signature Font - Not supported by Apple
Apple Support has confirmed Calibri is not an Apple/Mac-supported font.
When Calibri font is used in an email, and it is received by an apple product i.e an iphone/Mac computer, the operating system will change the font to its closest counterpart when viewed on apple products.
Calibri is distributed by Microsoft as part of their OS, where the font is re-formatted to use Apple equivalent fonts when viewed/passed. For other non-apple devices, the font will appear as normal.
There is no current workaround for this simply due to Apple not supporting Calibri as a font type.
You can change the font in the application to one of the other email-verified fonts (Templates > Signature > Font) for the signature detail if needed.
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