Can the same dedicated sending domain be shared amongst other Klaviyo accounts? Yes, the same dedicated sending domain can be shared amongst other Klaviyo accounts. Does the new account need to warm up the domain again? If the domain is already warmed up by a different Klaviyo account, the new Klaviyo account does not need to warm up the sending domain again. However, it’s important to be cognizant of the performance of all Klaviyo accounts that are using the same sending domain, as it will affect the sender reputation of that one domain.