If you look at Admin » Landing Pages » Domain Name, is the primary domain displayed with https://?
And under Options on the same page, does it say "Use Secure Pages: Yes"?
We aren't using a custom subdomain for landing pages, we're using Marketo's. So all those fields are blank currently.
There's also no option for "Use Secure Pages: Yes".
My other clients are all using http for their domain settings and images in emails are showing up just fine.
Images are being linked to from http://na-ab31.marketo.com currently.
I'm assuming it's my browser is blocking the image from loading due to mixed content error (loading http images on an https connection) but this doesn't happen with my other clients that do have custom domains set and http for the images.
Is the solution to just set a custom domain and move on/
Is the solution to just set a custom domain and move on?
Yes, I consider a Marketo instance without a custom domain to be not set up.