Email Signature Manager version 8.x
Email Signature Manager version 7.x
When you reply to, or forward, an email on an Apple iOS device, e.g. an iPhone or iPad, images in the HTML email are replaced with image001.png etc.
This is unrelated to Email Signature Manager and there is no resolution for this problem.
This is controlled by the Apple iOS operating system and there is no known workaround/fix for this.