Related Products: Exclaimer Cloud - Signatures for Office 365 | Exclaimer Cloud - Signatures for G Suite
On a reply or forward mail, this has become attachments and or appear to be removed from the email.
Some mail clients such as Apple Mail can cause Embedded Images to be stripped out of the signature template and or become attachments.
Unfortunately, this also applies to a signature or text elements that have been rendered as a bitmap. Whether you are using a Custom Font or a Background Image.
The only way to resolve this issue is to use a font stack in the signature template, this will allow you to use a custom font with fall back fonts next to it for the mail client to choose the next one available, in the list. Further information for this can be found here - 'Using custom fonts without rendering as bitmaps'
If you are using a background image, you may be able to substitute this as a banner image or use a background colour and split the image into different parts, as a suitable workaround.