Signature image logo not displaying in recipient mail clients

Signature image logo not displaying in recipient mail clients


Whenever I send an email to another person the image that forms part of my logo is not displayed just a broken link to: https://mail.zoho.com/mail/ImageSignature?fileName=Email-log.jpg&accountId=47238000000007001&storeName=NN1:-3205531763309921492
I can see the logo because I've got a zoho account and I'm logged on but others without a zoho account can't see it.

How do I fix this?

Thanks

-Martin