Do you have a sample? I’m not from Mixmax but I think they are using an email 
library built by me (Nodemailer) so I would be able to fix it if it really 
misbehaves.

Regards,
Andris Reinman

> On 30. Sep 2020, at 20:33, Mark Fletcher via mailop <mailop@mailop.org> wrote:
> 
> 
> Hello,
> 
> Long shot, but is anyone from mixmax.com on here? It appears they are 
> generating emails with incorrectly escaped Content-Type headers for 
> attachments with quotes in their file names, which is causing us to reject 
> their (otherwise valid) messages. 
> 
> Thanks,
> Mark
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