We have implemented the SSL for tracking pixels but I am still seeing non-ssl tracking pixel links in the emails. Am I missing a configuration somewhere or is this a bug/issue?
Please move the question to Products. "Community" is for questions about the Marketo Nation website itself, and yes, this is confusing.
The tracking pixel will still be embedded as http:// even if your instance has an SSL cert. You use HSTS to force an SSL connection.
What if the client browser/email client does not support hsts?
Then the connection will use plain text.
Does this mean that marketo does not support SSL links in emails? but only via hsts? I'm trying to figure out why our emails do not have ssl links when they were supposedly implemented.
As I've just described, whether or not your tracking server has an installed cert, links in emails (including the tracking pixel) will still be fetched over http://. It's left up to you to force HTTPS on the initial connection via HSTS.
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