Why does a signature need to be hosted?

Why does a signature need to be hosted?

I have an image of my business card I configured as a signature image with Thunderbird.

I send out emails to my other email accounts, and the image shows up fine. So, what is the reason I need to host the image?

I guess if someone has images blocked, they will not see it. So in that case, would they need to click a URL in order to see the image?

If so, I imagine this enables the recipient to select which image to view versus viewing them all?

I am trying to understand the value of hosting my signature image.

Please let me know.

newbiewebSr. Software EngineerAsked:
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Omar SoudaniSenior System EngineerCommented:
"You need to consider how your customers/clients view the emails you send them. If a large percentage use email clients like Outlook, then embedded images are probably the way to go. If, however, you know that a lot of recipients will view your emails on mobile devices, we recommend you use hosted imagery."

For full article:

Actually, hosting the signature, has a  MUCH HIGHER CHANCE of NOT SHOWING UP at the email program on the other side (as you may well know the "show images anyway" and "always show images from this sender" button most email programs employ now)
Where did you get the idea this was standard practice?

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newbiewebSr. Software EngineerAuthor Commented:
Wow! So if I simply use Thunderbird to add the signature file on my end, it has the best chance of being seen?
Yes, hosted material is usually block for security and privacy reasons.
newbiewebSr. Software EngineerAuthor Commented:
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