Send email

Twilio SendGrid

Email delivery service with an HTTP API and SMTP relay that sends transactional and marketing email and reports delivery events.

Methods

Method	Used for	How
API key (Bearer token)	Web API v3 and Mail Send	`Authorization: Bearer <YOUR_API_KEY_HERE>` header
API key over SMTP	SMTP relay	Username `apikey`, password is the API key, host `smtp.sendgrid.net`, port `587`
Signed Event Webhook or OAuth 2.0	Securing incoming webhook calls to your server	Configured on the Event Webhook

Source7API authentication

Getting access

Who creates the account: A person signs up; the docs do not describe agent self-sign-up8
Where to get a key: Console: Settings > API Keys > Create API Key8
Other requirements: Sender identity must be verified; accounts are limited to 100 API keys8

Read from Twilio’s own pages on 2026-11-04. Every number links to the page a value came from. For agents, the same facts as markdown: /tools/send-email/sendgrid.md