Side by side
Mail-Tester vs Microsoft SNDS
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 APIWeb
Mail-Tester offers a straightforward email check with a free allowance and paid integration options. Its score is not a promise of inbox delivery, and results have limited retention periods.
Visit Mail-Tester 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 SNDSThe facts
| Mail-Tester | Microsoft SNDS | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | Web |
| Lowest paid plan | 50 Tests / Month: $10 a month | Free or on request |
| Plans published | 10 | 1 |
| Maker | Not published | Not published |
| Website | mail-tester.com | substrate.office.com |
| On email deliverability software | #8 of 31 | #12 of 31 |
Mail-Tester: what it does well
- Free plan includes three tests per 24 hours.
- Checks authentication settings and blocklists.
- Paid plans provide iframe and JSON API access.
- Reopening a result does not count as another test.
What to know first
- Free results remain available for 7 days.
- Passing does not guarantee inbox placement.
- No inbox placement monitoring is listed.
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.
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