Sidemail vs Postmark
Two quality‑focused email platforms with different scopes. Here's how they compare for SaaS teams.
Quick overview ‑ which one is better?
Sidemail
WinnerPros
- All‑in‑one: transactional + marketing + automation
- Fast and reliable email delivery
- Visual drag‑and‑drop email editor
- 90‑day email history (vs 45 days)
- 5‑star support, including weekends
- Built specifically for SaaS
Cons
- Smaller company
- $4 higher starting price (but includes marketing + automation too)
Postmark
Pros
- Focused product
- Solid delivery of transactional emails
- Offers a complete self‑serve option
- Lower starting price ($15/mo)
Cons
- Missing functionality for email marketing
- No email automation
- No visual email editor
- Support unavailable on weekends (but otherwise usually responsive)
- 45‑day email history
Sidemail wins for all‑in‑one needs. Postmark wins for transactional-only with excellent deliverability.
Feature‑by‑feature comparison
Sidemail wins
Tied
Postmark wins
| Sidemail | Postmark | |
| Transactional emails | ||
| Marketing emails | Very limited | |
| Email automation | ||
| Visual editor | ||
| Premade templates | ||
| Contacts | Unlimited | - |
| Team members | Unlimited | Unlimited |
| Data history | 90 days | 45 days |
| Ease of setup | Fast | Fast |
| Support | Included in all plans | Included in all plans |
| Based in | 🇪🇺 EU | 🇺🇸 US |
Pricing comparison
Comparing the true cost of each platform. Starting prices:
Sidemail
All‑in‑one plan
- Transactional + Marketing + Automation
- 90‑day email history
- Visual email editor
- Unlimited team members
- Weekend support included
Postmark
Transactional only
- No marketing - need another tool ($20-50+/mo)
- 45‑day email history
- No visual email editor
- Unlimited team members
- No weekend support
Postmark is cheaper if you only need transactional email. But if you also need newsletters or marketing (most SaaS do), you'll need to add another service. Sidemail's $19/mo covers everything.
When to choose each?
Choose Sidemail if you...
- Need both transactional and marketing email
- Want email automation capabilities
- Prefer visual email building tools
- Need weekend support availability
- Want longer email history (90 days)
Choose Postmark if you...
- Only need transactional email
- Already have a marketing email tool
Frequently Asked Questions
Does Postmark offer marketing features?
No. Postmark is transactional-only. If you want to send product updates and newsletters, or set up email automations like for onboarding or churn prevention, you'll need a second service.
Is Sidemail's deliverability as good as Postmark's?
Yes, Sidemail maintains excellent deliverability with strict sending policies. Postmark is known for deliverability, and Sidemail matches (if not exceeds) that standard.
Can I migrate from Postmark to Sidemail easily?
Yes. Both have similar API patterns for transactional email. Migrating templates and switching API calls typically takes a day or two. Sidemail's support team can help with the transition.