SMTP

Reliable email relay, API, and delivery service

SMTP has been a leader in email relay services for over 20 years. The brand is synonymous with the technology that facilitates the internet鈥檚 email engine. SMTP is the solution that powers transactional emails for thousands of the world鈥檚 leading brands. SMTP鈥檚 relay services help build a better IP reputation, optimize inbox placement rates and ensure messages reach your subscribers.

5K annual users

5,000 annual users

11B emails sent

11 billion emails sent annually

5,000/s sending velocity

5,000 emails per second sending velocity

Recent News

Yahoo! Finance  
"RetailMeNot is evolving from a destination for deals into a complete shopping companion," said Magali Darling, Chief Commercial Officer at RetailMeNot. "This next chapter isn't just about celebrating our history, it's about meeting shoppers in the moment with AI-driven precision and elevated mobile shopping experiences that make every purchase feel more confident. We're bringing a true glow-up to digital savings, one that delivers more value for consumers and stronger performance for brands."
Tom's Guide  
The scores are in for the U.S.A.'s Big 3 mobile carriers in Ookla RootMetrics's State of the Mobile Union Report for the second half of 2025. The big winner is Verizon, which won five of RootMetrics' eight headline awards outright, and tied for another two...includes wins for overall performance and reliability, plus it scored best for general 5G performance, while also improving its download speeds in metro regions. AT&T tied for three awards, putting it in second place. It came second on a state-by-state basis too, and managed to improve both its metro test results, managing to meet gold standard of 100 Mbps download speeds in the 125 metro test regions for the first time. T-Mobile shares just one award - U.S. Network Speed - with AT&T, earning it the bronze medal.
Morningstar  
"Patients today face a complex healthcare landscape, and finding the right physician can feel overwhelming," said Steve Leibforth, Managing Director of Castle Connolly. "The Top Doctor recognition represents more than an honor-it's a mark of trust, signaling to patients that these physicians have earned recognition from their peers for clinical expertise, compassionate care, and professional excellence. In an era of uncertainty, that assurance matters more than ever."
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