Official comment
ONTRAPORT does offer an integration with 250ok, a service that tests email deliverability. Refer to these articles for the details:
- Managing Email Delivery with 250ok
- Using and Interpreting 250k Seed Tests
Here's how it works: 250ok creates "seed test contacts" that reflect the mix of ISPs you have in your list. You import those contacts and give them a tag that indicates they are seed test contacts. You can test not only the content of a particular email sent to all your contacts, but also how well an email would be delievered to any group of contacts.
Those articles should answer any questions you have, but feel free to contact our team at postmaster@ontraport.com with any additional questions pertaining to your specific requirements.