Is it possible to add inline image?

[xpcpku]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

none

Any log messages given by the failure

none

Expected/desired behavior

For my case, I want to send an email with header/footer, both are inline images, I did not find any api to support it, is it possible to do so?

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

Versions

any

Mention any other details that might be useful

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