@jtanusri @hpavlac there's another post in the community here:https://nation.marketo.com/t5/product-discussions/marketo-email-issues-on-outlook-for-mac/m-p/335475... where something similar came up and this approach seems to have solved the issue there. Let me know if you need any help implementing this into your HTML or if you were able to get this working? Thanks!