Postmark
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Postmark combines transactional email delivery with marketing email capabilities in a single platform. Since 2009, it's provided agencies with dedicated server organization, allowing teams to manage multiple client projects under one account with full isolation. The platform includes detailed bounce handling, message tracking, and template management built specifically for sending at scale.
Postmark works best for agencies that send both transactional and marketing emails at volume. Its granular permission system lets you give clients or team members project-level access without exposing other accounts, making it solid for multi-client operations. Compared to consumer-focused alternatives, it prioritizes deliverability and audit trails over feature breadth.