Yes, both Postmark and Campaigner offer a Free Trial.
Postmark is designed for Individuals, Freelancers, Medium Business and Small Business.
Campaigner is designed for Large Enterprises, Medium Business and Small Business.
Pricing details for both Postmark and Campaigner are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to Postmark includes SMTP, Campaigner and Moosend.
Some top alternatives to Campaigner includes Moosend and SMTP.