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Connect SendGrid

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TL;DR
  • Host smtp.sendgrid.net, port 587.
  • Username is literally apikey; the password is your SendGrid API key.
  • Authenticate your sending domain in SendGrid first for the best deliverability.
Setting Value
Host smtp.sendgrid.net
Port 587 (STARTTLS) or 465 (turn on Use secure (TLS/SSL))
Username apikey
Password Your SendGrid API key (with Mail Send permission)

Before sending, complete Domain Authentication in SendGrid so your SPF and DKIM records match the address you send from.