CritSend Transactional Email Service

CritSend is a SMTP relay for developers.

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Send transactional emails with minimal setup time

Guarantee your business-critical emails reach their recipients with the highest delivery rates and lowest fear of spam folders.

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What is CritSend Transactional Email Service?

Transactional email services provide a range of features and options that differentiate them from other leaders. CritSend offers dynamic spam folder placement detection, on-demand spam folder placement resolution, and a blacklist manager, which are not available with the current leaders. They also provide globally distributed sending infrastructure, custom SPF and DKIM, custom tracking domains, and automated dedicated IP warmup. In addition, CritSend offers multiple transactional templates per account, automatic CSS inlining, spam filter testing, and detailed reporting and analytics, including a 30-day detailed and searchable activity log. They also provide features such as configurable email alerts, split testing for transaction emails, webhooks, and geolocation and client email tracking.


  • Dynamic spam folder placement detection and resolution
  • Custom SPF, DKIM, and tracking domains
  • Pay-As-You-Go pricing for all users
  • Multiple transactional templates per account
  • Detailed reporting and analytics with a searchable activity log


  • Global sending infrastructure with custom SPF, DKIM, and tracking domains.
  • Pay-As-You-Go pricing available for all users.
  • Detailed reporting and analytics, including a 30-day activity log and transactional email capability.


  • Limited availability of features for all users.
  • Lack of multiple transactional templates per account.
  • Limited reporting and analytics capabilities compared to leaders.
Get super-awesome email engagement

Get better ROI on
every email you send

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