Alternatives to Twilio Email API

Twilio SendGrid

It suits teams that need email delivery through an API or SMTP and want delivery activity tracking and email validation.

turboSMTP suits website and app operators sending transactional email, as well as teams running newsletters or campaigns.

It is aimed at organizations running enterprise email gateways or high-volume SMTP servers that need control over outbound delivery.

Nuntly

Nuntly suits developers who want to handle outbound and inbound transactional email, replies, and delivery visibility through an API.

ReachMail suits organizations looking for campaign tools and transactional email delivery in one service.

Reloop

It suits teams building transactional email workflows that want API or SMTP delivery, inbound routing, or self-hosting.

MailerSend

MailerSend suits developers and teams integrating transactional email through an API or SMTP relay.

Maileroo

Maileroo suits developers and scaling businesses sending transactional or marketing email through SMTP or an API.

Netcore describes this service for mid-market and enterprise B2C brands in sectors such as ecommerce, retail, BFSI, media, travel, edtech, and D2C.

Retarus Transactional Email

The service is aimed at software vendors, platform businesses, large enterprises, and highly regulated industries that send transactional email from business applications.

Posta

Posta suits teams that want open-source email delivery on their own infrastructure.