Side by side
Microsoft SNDS vs SenderSignal
Both stand on email deliverability software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
Choose Microsoft SNDS if you send mail to Outlook.com consumers and need IP data, reputation monitoring, or feedback loop settings at no cost. Look elsewhere if inbox placement or spam trap monitoring is essential, since SNDS does not provide either.
Visit Microsoft SNDS
Free plan Web
SenderSignal combines monitoring, inbox placement tests, and sending warmup with a free tier and a 30-day trial. Review the plan caps and pause policy if you expect usage to exceed your allowances.
Visit SenderSignalThe facts
| Microsoft SNDS | SenderSignal | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 4 |
| Maker | Not published | Not published |
| Website | substrate.office.com | sendersignal.com |
| On email deliverability software | #12 of 31 | #16 of 31 |
Microsoft SNDS: what it does well
- Free service for senders.
- Shows detailed data about individual IPs.
- Includes sender reputation monitoring.
- Includes blocklist monitoring and API access.
- Combines IP data and feedback loop settings in one portal.
What to know first
- No inbox placement monitoring.
- No spam trap monitoring.
- Network access expires after 10 months and requires ownership reattestation.
- Trap hit counts are no longer included in Data Reports.
SenderSignal: what it does well
- Free tier covers two monitored domains.
- Includes two inbox placement credits per month.
- All plans include email alerts.
- Trial includes deliverability monitoring for 30 days.
- Placement tests cover six listed email services.
What to know first
- Free tier has two placement credits monthly.
- Assets above plan limits pause after a seven-day grace window.
- Inbox Boost volume is capped by plan.
- Some alert channels are still rolling out.
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