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SendGrid vs Amazon SES vs Postmark: Transactional and Marketing Email Service Comparison By Email Extractor Published October 10, 2026 5 min read
SendGrid Amazon SES Postmark transactional email email API
On this page All three services can send email via API, but they serve different primary use cases:
Aspect
SendGrid (Twilio)
Amazon SES
Postmark
Parent company
Twilio
Amazon Web Services
ActiveCampaign
Primary strength
Full-featured email platform (transactional + marketing)
Low-cost, high-volume sending infrastructure
Fast, reliable transactional email delivery
Best for
Companies needing both transactional and marketing email in one platform
High-volume senders wanting lowest cost; AWS-native architectures
Applications where transactional email speed and inbox placement are critical
Market position
Most popular email API provider
Lowest cost per email; dominant in AWS ecosystem
Premium transactional email; best inbox placement
Free tier
100 emails/day (forever)
62,000 emails/month (from EC2 only)
100 emails/month (free developer plan)
Feature Comparison
Sending capabilities
Feature
SendGrid
Amazon SES
Postmark
Transactional email
Yes
Yes
Yes (primary focus)
Marketing email
Yes (built-in campaign tools)
Basic (templates + SES)
Separate "Message Streams" (added later)
SMTP relay
Yes
Yes
Yes
REST API
Yes (v3 API)
Yes (SES v2 API)
Yes
Client libraries
7 languages (C#, Go, Java, Node, PHP, Python, Ruby)
AWS SDK (most languages)
10+ languages
Webhooks (event notifications)
Yes (opens, clicks, bounces, spam reports)
Yes via SNS (bounces, complaints, deliveries)
Yes (opens, clicks, bounces, spam complaints)
Inbound email processing
Yes (parse incoming email)
Yes (receive email; route to S3, Lambda, SNS)
Yes (inbound processing)
Scheduled sending
Yes
No (build your own with SQS/Lambda)
No
A/B testing
Yes (subject, content, send time)
No
No
Email validation
Yes (built-in; additional cost)
No
No
Templates and content
Feature
SendGrid
Amazon SES
Postmark
Template management
Yes (dynamic templates with Handlebars)
Yes (SES templates with Handlebars)
Yes (Mustachio templates)
Visual template editor
Yes (drag-and-drop builder)
No
No (code-based only)
Dynamic content
Yes (Handlebars; conditional logic)
Yes (Handlebars)
Yes (Mustachio; conditional logic)
Template versioning
Yes
No
Yes
Link tracking
Yes (configurable)
Yes (configurable)
Yes (configurable)
Open tracking
Yes (configurable)
Yes (configurable)
Yes (configurable)
Unsubscribe management
Yes (built-in)
No (build your own)
Yes (built-in for broadcast streams)
Deliverability
Feature
SendGrid
Amazon SES
Postmark
Shared IP pools
Yes (free plans)
Yes (default)
Yes (separated by stream type)
Dedicated IP address
Yes ($20-$60/month per IP)
Yes (free; request from AWS)
Yes (available on higher plans)
IP warm-up automation
Yes (automated warm-up)
No (manual warm-up required)
Managed by Postmark
SPF / DKIM setup
Yes (automated with DNS)
Yes (manual DNS configuration)
Yes (automated with DNS)
DMARC support
Yes
Yes
Yes
Bounce handling
Automatic (suppresses hard bounces)
Automatic (suppresses via suppression list)
Automatic (suppresses hard bounces)
Spam complaint handling
Automatic (suppresses complainers)
Automatic (via feedback loops)
Automatic (suppresses complainers)
Deliverability reporting
Yes (block, bounce, spam, invalid rates)
Yes (reputation dashboard; deliverability metrics)
Yes (detailed per-stream metrics)
Deliverability consulting
Yes (Expert Services; additional cost)
No
Yes (included on higher plans)
Published delivery speed
Not published
Not published
Average under 10 seconds (published)
Transactional vs marketing separation
Subusers and IP pools
Configuration sets
Message Streams (built-in separation)
Analytics and reporting
Feature
SendGrid
Amazon SES
Postmark
Real-time dashboard
Yes
Yes (CloudWatch; SES console)
Yes
Email activity feed
Yes (last 3-30 days depending on plan)
Via CloudWatch Logs (additional cost)
Yes (45 days of full content)
Category / tag reporting
Yes (categories; unique args)
Yes (tags; configuration sets)
Yes (tags; metadata)
Geographic reporting
Yes (by country)
No (build with CloudWatch)
No
Device / client reporting
Yes
No
No
Exportable reports
Yes (CSV)
Via CloudWatch or custom (S3)
Yes (CSV; API)
Pricing Comparison
At various sending volumes (monthly)
Volume
SendGrid
Amazon SES
Postmark
1,000 emails/month
Free (100/day limit)
$0.10 (outside EC2)
Free (100/month free plan)
10,000 emails/month
Free (100/day limit) or $19.95/month (Essentials)
$1.00
$15/month
50,000 emails/month
$19.95/month (Essentials; up to 50K)
$5.00
$85/month
100,000 emails/month
$34.95/month (Essentials; up to 100K)
$10.00
$155/month
500,000 emails/month
$249/month (Pro; up to 600K)
$50.00
$555/month
1,000,000 emails/month
$449/month (Pro; up to 1.5M)
$100.00
Custom pricing
5,000,000 emails/month
Custom (Premier)
$500.00
Custom pricing
Additional costs
Cost type
SendGrid
Amazon SES
Postmark
Dedicated IP
$20-$60/month per IP
Free (request from AWS)
Included on higher plans
Email validation
$0.003-$0.008 per email
N/A
N/A
Inbound email
Included
$0.10 per 1,000 incoming emails
Included
Attachments
Included
$0.12 per GB
Included
Storage (activity log)
Included (3-30 days by plan)
CloudWatch costs apply
Included (45 days)
Use Case Recommendations
If you need...
Best choice
Why
Lowest cost at high volume
Amazon SES
$0.10 per 1,000 emails; no monthly minimums
One platform for transactional + marketing
SendGrid
Built-in marketing tools; campaign builder; contact management
Fastest, most reliable transactional delivery
Postmark
Sub-10-second delivery; dedicated transactional infrastructure
AWS-native architecture
Amazon SES
Native integration with Lambda, SNS, S3, CloudWatch
Visual email template building
SendGrid
Drag-and-drop template editor
Startup with low volume
SendGrid or Amazon SES
SendGrid: 100 free/day; SES: 62K free from EC2
Developer experience and documentation
Postmark
Clean API; excellent documentation; fast support
Full marketing automation
SendGrid (or consider dedicated ESP)
Marketing campaigns; automation; A/B testing
Compliance-sensitive sending (healthcare, finance)
Postmark or SendGrid
Better deliverability controls; compliance features
If you need to avoid...
Avoid
Why
Building your own unsubscribe, bounce, and complaint handling
Amazon SES
SES provides building blocks; you assemble them
Complex AWS configuration
Amazon SES
SES requires IAM, SNS, SQS, CloudWatch setup
Slow support response
Amazon SES (basic support)
AWS support depends on support plan (extra cost)
Marketing emails in same stream as transactional
Postmark (before message streams)
Postmark separates streams (now a feature, not a limitation)
Whichever sending platform you choose, start with clean data. All three platforms penalise poor list quality: SendGrid may suspend accounts with high bounce rates; Amazon SES may throttle or suspend sending; Postmark has strict bounce and complaint thresholds. Before importing contacts into any sending platform, upload your email lists from CRM exports (CSV), marketing platform exports (CSV), spreadsheet lists and other sources to Email Extractor to extract and deduplicate email addresses. Deduplication prevents sending duplicate messages (which inflate costs on all three platforms and annoy recipients) and removes formatting issues that cause bounces.
Extract emails
