Alternatives to Postmark
Other Email marketing vendors we measure, sorted by how much they publish that Postmark does not. This is a comparison of disclosure, not of features or fitness.
12 shown of 20 that differ from Postmark on at least one criterion we measured for both. Public transparency score, not a product or security rating.
Postmark has 7 gaps in what we could measure: Subprocessor list, Data location stated, Status page with history, Certifications named, Uptime SLA with a figure, No third-party tracking before consent, security.txt (RFC 9116). The column “publishes and Postmark does not” is the one that closes them.
| Vendor | Score | Publishes, and Postmark does not | Postmark publishes, and they do not | |
|---|---|---|---|---|
| Mailgunmailgun.com | 83/100 | 5 Data location stated, Status page with history, Certifications named, +2 | nothing | Compare |
| ActiveCampaignactivecampaign.com | 78/100 | 5 Subprocessor list, Data location stated, Status page with history, +2 | 1 Public pricing | Compare |
| Customer.iocustomer.io | 80/100 | 4 Subprocessor list, Data location stated, Status page with history, +1 | nothing | Compare |
| CleverReachcleverreach.com | 48/100 | 4 Data location stated, Status page with history, No third-party tracking before consent, +1 | 2 Data processing agreement, HTTPS enforced with HSTS | Compare |
| Klaviyoklaviyo.com | 65/100 | 3 Subprocessor list, Status page with history, Certifications named | nothing | Compare |
| Mailchimpmailchimp.com | 57/100 | 3 Subprocessor list, Data location stated, security.txt (RFC 9116) | 1 HTTPS enforced with HSTS | Compare |
| Omnisendomnisend.com | 57/100 | 2 Status page with history, security.txt (RFC 9116) | nothing | Compare |
| Substacksubstack.com | 38/100 | 2 Data location stated, Status page with history | 2 Data processing agreement, Public pricing | Compare |
| Elastic Emailelasticemail.com | 35/100 | 2 Data location stated, Status page with history | 2 Data processing agreement, HTTPS enforced with HSTS | Compare |
| SendGridsendgrid.com | 18/100 | 2 Status page with history, Certifications named | 3 Data processing agreement, Public pricing, HTTPS enforced with HSTS | Compare |
| EmailOctopusemailoctopus.com | 43/100 | 1 Data location stated | nothing | Compare |
| Flodeskflodesk.com | 26/100 | 1 Data location stated | 2 Data processing agreement, HTTPS enforced with HSTS | Compare |
Only criteria we could measure for both are counted. Where we could measure one and not the other, the row is silent: that would be a statement about our measurement, not about either vendor. Every single result with its source is on the two profiles.