Access your RoundCube webmail from your Site Tools > Email > Accounts, go to the kebab menu > Log in to Webmail. After that go to Settings > Preferences > Composing Messages. Once there configure the following options so RoundCube will attach a signature to your emails:
How to add image signature to your RoundCube Webmail Client?
- Compose HTML messages to Always
- Automatically Add Signature to Always
To edit the signature itself, go to Settings > Preferences > Identities. You can either choose the default identity or create a new one.
Under the Signature section check the box next to HTML signature and enter the desired information in the Signature field. You have two options to add an image to your signature:
- Use the Insert/edit image in the Signature field. In this tool, you can upload an image from your computer, or specify the image URL location (e.g. http://yourdomain.com/image.jpg).
- Alternatively, you can drag and drop the image URL from your browser to the Signature field in RoundCube.
Finally, save the changes, and the image of your choice will appear when you compose your messages.