FlexMail

FlexMail is a Belgian email marketing platform with a long-standing partner program specifically designed for agencies that want to resell email marketing under their own terms. The platform supports multi-account management so you can handle multiple client databases from one interface, and it includes customizable client pricing that lets you set your own margin per client. The partner program provides dedicated support and co-marketing resources as you grow your client base.

It's a solid regional option for European agencies, particularly those based in or serving Belgium and neighboring markets where FlexMail has established relationships with local providers. The feature set covers automation, segmentation, and standard reporting, without the complexity of enterprise platforms that often overkill smaller agency needs. If you're building an email service reseller business in Europe, FlexMail's approachable partner structure and pricing flexibility make it worth evaluating against larger, more expensive alternatives.