Remove "Sent from Mailspring" text

How do I remove the “Sent from Mailspring” text from my sent emails?

When you first download Mailspring, emails you send display a tag-line:

"Sent from Mailspring, the best free email app for work"

Removing this tag-line is easy and free to do. Run Mailspring and visit Preferences > Signatures. This text is included in the default signature and you can edit the signature to remove it, delete the signature entirely, or create a new one.