We have carefully reviewed Mailpool and are happy to recommend them for your cold outreach.
First, they offer a full range of mailbox types (SMTP, Google Workspace, and Microsoft 365). They do not offer Azure tenants, but honestly, that’s for the best.
Second, they provide full API access on all plans.
Third, you have the option to purchase dedicated IPs and even a dedicated infrastructure upon request.
The only downside we noticed is the higher price point and the lack of volume discounts. For comparison:
- Our SMTP boxes start at $1.80 (domains included), while Mailpool starts at $3.
- Our Google Workspace accounts start at $2.70, whereas Mailpool’s start at $4.