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@douddle Thank you for signing the Contributor License Agreement!

@douddle, are you using Spring's JavaMailSenderImpl to send the email?

If so, you can create your own mime.types file and instruct JavaMailSenderImpl to use it (instead of the default file) by supplying a custom configured instance of ConfigurableMimeFileTypeMap via JavaMailSenderImpl.setDefaultFileTypeMap(...). On the ConfigurableMimeFileTypeMap you can invoke setMappingLocation(...) with your custom mime.types file. Alternatively, you can invoke setMappings(...) on the ConfigurableMimeFileTypeMap to add an explicit SVG mapping.

This has been merged into master.

Thanks