CloudMailin vs Twilio SendGrid

CloudMailin receives email and delivers it to web applications through HTTP POST webhooks. Inbound messages can arrive as JSON, multipart form data, or raw text; attachments can be forwarded to a webhook or stored in Amazon S3, Azure Storage, or Google Cloud Storage. It also sends transactional email through an API or SMTP relay. Outbound tools include spam checks, link and open tracking, bounce handling, reporting, tagging, and priority queues. Inbound delivery history includes 30 days of searchable records with error and retry details, while metadata retention is listed as 60 days. CloudMailin says its inbound service works with any language or framework, naming examples from Node.js and Python to Java and C#. The service was founded in 2010 and is available through an API and the web. A free plan allows 10,000 emails per month and 512KB per message. Paid plans start at $25 a month; the listed options include different email and message-size limits. A seven-day trial is also listed.

Twilio SendGrid Email API sends email through a cloud-based delivery service, so customers do not need to maintain their own email servers. Messages can be sent through its RESTful Web API, SMTP relay, or SMTP API, with open-source client libraries for C#, Go, Java, Node.js, PHP, Python, and Ruby. Tools include dynamic templates, an Email Validation API, deliverability insights, and email testing. The Email Activity API, Event Webhook, and Activity dashboard track deliveries, opens, clicks, bounces, unsubscribes, and spam reports. Security features listed include SPF, DKIM, DMARC, TLS encryption, and API keys that can be limited or revoked. Twilio states a 99% deliverability rate. A 60-day free trial is listed at free, with limits of 100 emails per day and 100 contacts. Pay as you go is free; Essentials starts at $19.95 a month and Pro at $89.95 a month. Each email to one recipient uses a credit, even if deferred or sent to spam. Twilio says SendGrid does not natively support HIPAA-compliant data transmission.