Postmark
7.6#2 in email deliverability softwareFree planFree planWebAPI
VisitPostmark vs SenderSignal
SenderSignal
5.7#30 in email deliverability softwareWeb
VisitWhat both publish
| Fact | Postmark | SenderSignal |
|---|---|---|
| Free tier | Every new account starts with a free Developer plan offering 100 emails per month. | The free tier includes two monitored domains, email alerts, and two inbox placement credits per month, with no credit card required. |
| Integrations | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. | Email alerts are available on all plans; Slack and HMAC-SHA256-signed webhooks are available on Professional and above. |
| Support | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. | The Professional, Business, and Growth plans list priority support; Enterprise lists priority enterprise support with an SLA. |
| What it does | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. | SenderSignal offers email reputation building, blacklist and deliverability monitoring, and inbox placement testing. |
Postmark plans
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
SenderSignal plans
- Business—
- EnterprisePriced on request
- Growth—
- Professional—
Pick Postmark if…
Postmark suits developers who need to send application email through an API or SMTP and track delivery events. Its inbound processing and message streams also suit services handling both incoming and different types of outgoing email.
Pick SenderSignal if…
SenderSignal suits teams monitoring email reputation and placement, including agencies, e-commerce, SaaS, cold outreach, and high-volume senders. Its free tier may suit users who need basic domain monitoring and a small number of monthly placement credits.