So with our current ESP we have logic queries in our footers that look like the below to direct them to our ESP's unsub page or our internal hosted unsub page:
<#if unsub-i-is-null>${form('myesp_hosted_unsub', {}, 'EMAIL_ADDRESS_=' + EMAIL_ADDRESS_)}<#else>https://www.mysite.com/page?t=lun&eid=eml-esp-unsub:CAMPAIGNID:${campaign.id};LAUNCHID:${launch.id};...
Our Footers would be in Visual Fragments and we would use Expression Fragments for static links like our homepage and other fixed info, but this I'm not sure I could do with an expression fragment or not.
