# MxToolbox alternative for senders checking email authentication and blocklists

> For senders checking email authentication and blocklists, Zalwin's EmailAuthPulse, DnsBlacklistPulse, NewsletterDeliverabilityKit cover email deliverability with a free preview without an account, paid plans from $4.99, and API and MCP access. Sources are public; MxToolbox is a separate product we are not affiliated with.

| What you need | Zalwin | MxToolbox |
|---|---|---|
| Who it is for | senders checking email authentication and blocklists | Check MxToolbox's site |
| Free preview | Yes, no account needed | Check MxToolbox's site |
| Starting price | $4.99 (published on each product page) | Check MxToolbox's site |
| Data sources | Public DNS lookups; Read-Only DNS Zone, MTA-STS, TLS-RPT & RBL Health Checker; Public DNS lookups and public DNS blocklists | Check MxToolbox's site |
| Records available now | Scan-based tool | Check MxToolbox's site |
| API and AI-agent (MCP) access | Yes: REST API and MCP tools | Check MxToolbox's site |
| Update cadence | EmailAuthPulse: runs live per scan; DnsBlacklistPulse: runs live per scan; NewsletterDeliverabilityKit: runs live per scan | Check MxToolbox's site |

- [EmailAuthPulse](https://zalwin.com/emailauthpulse): SPF, DKIM, DMARC and BIMI check and record generator
- [DnsBlacklistPulse](https://zalwin.com/dnsblacklistpulse): Live domain and mail-server IP spam blocklist (RBL), MTA-STS, TLS-RPT and PTR record scanner
- [NewsletterDeliverabilityKit](https://zalwin.com/newsletterkit): Checks bulk-sender rules, SPF lookups, ESP includes, DKIM, DMARC, BIMI, MX and blocklists, with an ESP-specific DNS fix pack

**Is Zalwin affiliated with MxToolbox?** No. MxToolbox is a trademark of its owner. This page describes Zalwin's tools; for MxToolbox's current features and pricing, see its own site.

**What does it cost?** EmailAuthPulse from $4.99; DnsBlacklistPulse from $4.99; NewsletterDeliverabilityKit from $4.99. Every tool has a free preview.

**Where does the data come from?** Public DNS lookups; Read-Only DNS Zone, MTA-STS, TLS-RPT & RBL Health Checker; Public DNS lookups and public DNS blocklists. Public sources only; company-level records.

_MxToolbox is a trademark of its owner; Zalwin is not affiliated with it._