Key differences between Amazon SES and Postmark
Migrating email service providers can be a large undertaking. We want to help relieve some of that stress of moving to Postmark from Amazon SES. This guide will detail some of the differences and similarities between SES and Postmark, as well as give some useful tips for migrating to Postmark from SES.
It includes details on differences between the Postmark and SES APIs, sending outbound emails, processing inbound emails, UI differences, and webhooks. For quick reference, we have included tables where possible to equate SES functionality and JSON fields to their comparable functionality and fields in Postmark.
Key differences between SES and Postmark #
These are some important differences to be aware of when moving over to Postmark from SES:
- Postmark does not allow anyone to send marketing or bulk email, whereas SES does. If you were sending your marketing and/or bulk email through SES and want to switch those over to another provider, we highly recommend using Campaign Monitor for any bulk email you need to send.
- Since Postmark does not allow bulk email (including subscription newsletters), there are no list management features available in Postmark, such as creating lists, handling unsubscribes, or adding unsubscribe links to your emails automatically.
- You do not need to set up your own logging or perform any additional steps to store sent messages. Successfully sent messages are stored for 45 days in Postmark automatically (including the content and delivery events). Sent messages are available to view using our UI or you can pull them with our REST API.
- Bounces and spam complaints are also stored indefinitely, for troubleshooting purposes.
- Postmark uses a pay as you go credits model instead of monthly billing for the previous month’s usage. See our pricing page for more details. One credit is used per email sent/received and credits never expire. Credits are purchased in advance and discounts are offered for large volume credit purchases.
- Postmark starts you with 25,000 free credits when you create your account but you will need to purchase more credits once those are used. There are no free tier options available.
- There is not an option to purchase dedicated IPs from the Postmark UI. Most customers use our well-maintained, shared IP ranges. We do not recommend using dedicated IPs for most senders but do move high volume senders to dedicated IPs at no additional charge. As a result, you are never responsible for warming up an IP. We take full responsibility for managing IP addresses and warming them up.
- Postmark does not have a reseller or affiliate program.
- Postmark’s account approval process is automatic. There is no ‘moving out of the sandbox’ process like with SES. You may be contacted for more information if we need it when reviewing your account, but odds are you won’t hear anything from us except the approval confirmation within 24 hours.
- Postmark does not have sending quotas or maximum sending rates that you have to adhere to or request increases on. You can send as many emails as you need to, when you need to send them.