Hi @suanntan - I have used the 250ok deliverability through marketo. That "integration" has been deprecated at this point but they are willing to work with Adobe to try and implement it on a case-by-case basis. Otherwise, you can still purchase a solution through them and use their specific dashboards vs. going through marketo. It's not that much different in my opinion. 250OK is now technically Everest by Validity.
The platform is easy to use and checks a lot of the boxes you would be looking for with email deliverability and design testing. Making your decision will really be based on what is most important to you and the business. For example, Everest has a variety of capabilities surrounding deliverability one of which is Infrastructure and IP monitoring. That may be helpful if you are on a dedicated IP. There are also inbox placement tests to see where your email would land in users inboxes. I would say the most helpful way to make a decision is to schedule a demo for each platform you are interested in and find out what the differences are and which features are most important.
I cannot for the life of me remember what the actual process for the verification is, I'm thinking it's a list upload to verify, but cannot confirm, it has been a little bit since I used the platform.
In terms of pricing, of course most of the platforms do semi custom quotes/base it off your business needs, but I can give you a general idea. Email on Acid seems to be the most affordable, then 250ok and then litmus. Litmus came with a hefty price tag.
Lastly, always rely on your own data first if you have it. If you're using a purchased list (not recommended), etc. then these tools will be much more important. I have seen discrepancies in certain platforms such as "Neverbounce" where the list will be run through the program, say we will have a say 90% bounce rate and then our actual bounce rate for a send will be much higher, so I do not like to rely on those programs entirely. I will note though that these are our own leads from events, etc. and not a purchased list.
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