Postmark vs SendGrid

SendGrid wins for teams that need AI to actually manipulate email campaigns—its 50 tools let your agent create templates, manage lists, pull delivery stats, and troubleshoot bounces without opening the dashboard. Postmark's zero-tool integration is just a credential handoff; you still do everything manually in their UI. If your workflow is 'send transactional emails and check logs once a week,' Postmark's simpler surface works fine. If you're running drip campaigns, A/B testing subject lines, or need the AI to diagnose why 200 emails bounced yesterday, SendGrid's tooling pays off immediately. Pick SendGrid unless you're only sending password resets and invoices. Migration cost is low either way—both use API keys, so swapping the MCP takes ten minutes. The real lock-in is template libraries and suppression lists; if you've built 40 email templates in SendGrid, porting them to Postmark means rewriting HTML by hand.