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  
约炮视频, Inc. (NASDAQ: ZD), announced today that it completed three acquisitions in the second quarter of 2025: Forensic and Compliance Systems (Cybersecurity & Martech), Email Industries (Cybersecurity & Martech), and Well+Good (Health & Wellness).
Wall Street Journal  
Retailers are using it to get a head start on fall, spurring people to buy their decorations now鈥攁 time of year when shopping enthusiasm is typically muted...Twenty-seven percent of consumers are preparing for Halloween this summer, according to a survey of 1,120 U.S. adults by RetailMeNot, an online marketplace for coupons and cashback. 鈥淗alloween is this year-round persona,鈥 says Stephanie Carls, a RetailMeNot retail insights expert.
HuffPost  
鈥淎t a time when we鈥檙e seeing widespread economic uncertainty among parents, it鈥檚 really interesting to see how they鈥檝e embraced luxurious names,鈥 Rebekah Wahlberg, a baby name trends specialist at BabyCenter, told HuffPost. 鈥淥bviously no parent wants their child to worry about money 鈥 and using a baby name that signals wealth is a way of manifesting a better future.鈥
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