Relevant Products: Exclaimer Cloud - Signatures for G Suite
You are using a Exclaimer Cloud - Signatures for G Suite to append professional email signatures to messages sent from Gmail and mobile devices.
You have removed existing Gmail signatures but you also need to remove the default ‘Sent from iPhone’ signature for iPhone users (or similar default messages for other devices).
Exclaimer products cannot remove content from the message body. Since mobile devices cannot be easily managed from the Active Directory domain, these default signatures should be removed from devices manually.