I have a couple dedicated servers for my ecommerce store. I just moved to a large host company.
My sales receipts are flagged as spam by the host's internal system, and they paused my email account and changed my passwords without permission as a precaution.
After calling tech support to resolve the issue, they thought I needed to use a third party email service. (for example mail chimp, send grid, and mail gun were mentioned; per rules do not recommend a specific brand please)
I may sell 600-1000 order per day, which is how I can afford dedicated servers. Is it common for ecommerce stores to use a 3rd party for sending transactional emails, or should I expect more from my host?
Each sale generates about 3 emails: a receipt, a tracking number once shipped, and a follow up email inviting a review (and an opportunity for me to correct a problem before it escalates to a review site).