The best replacement for sendgrid is mailchimp.

The best alternatives to sendgrid are rated as following:
★★★★★  mailchimp
★★★★★  mandrill
★★★★  mailgun
★★★  ses
★★  mailjet
★★  elastic email
★  silverpop
★  constant contact
★  sendy
  postmark

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Google Trends

Scale is based on the average worldwide traffic of sendgrid in all years. Click on graph for more.
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