I didn't know this was happening until I noticed on an email that someone replied to. There is a second email signature with an image that has been attached to my email after it has been sent. Checking the source code I see the image is from Wix, which is the site that hosts 2 web sites for me. The image used is one that was removed from Wix some time ago. When I contacted the folks at Wix I am told that this is a Thunderbird issue and this: Wix has no control over how Thunderbird interprets data. This is not a Wix issue, it's a Thunderbird issue (specifically, Thunderbird is capturing and adding SEO data to the end of the message). You need to contact them to resolve this issue. I don't see this happening on every email, in fact only one recipient that I know of that has replied and that second email signature was attached. It seems very odd to me that an image that has been removed from Wix is being picked up and added to my email. At this point Wix 'support' is just blowing me off (and I'm a paying customer... for the moment.) Anyone else ever see this or have any idea what is happening? I could really use some help with this. Thanks!