Use https protocol instead http in tracking url
Now we have troubles with removing our domain from blacklist because of using non-secure protocol in tracking pixel: http:email.ourdomain.com/bla-bla-bla. Your system doesn't provide ability to use https now, but it would be very useful to provide it

Hello,
Just to provide closure here - Mailgun does support secured tracking links. We offer an industry first certificate hosting on our side that does not require complex and costly CDN management. Reach out to our support team for assistance.
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Oliver Hookins commented
This is supported today, unless I misunderstand your request. You can choose http or https protocol for tracking links.
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Tom Scheepers commented
Multiple of our customers cannot open their mail because of security settings.
These settings block the mail because the mail has http:// tracking links.We would very much like this feature!
Tom Scheepers