MXToolbox alternatives
Providers that compete with MXToolbox on at least one of: Deliverability
Blacklist, DNS, DMARC, and delivery monitoring tools.
Switching as teams building autonomous agents
An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.
MXToolbox does not cover inbound parsing, idempotency keys, webhook coverage, batch sending, SDK breadth, and multi-tenant support. MailReach, EasyDMARC, and dmarcian close that gap. The order below weighs this audience's priorities first, so it differs from a general popularity ranking.
ranked for teams building autonomous agents
- 01
MailReach
DeliverabilityEmail warmup plus spam testing for outbound teams.
Adds webhook coverage and multi-tenant support over MXToolbox, with nothing given up on these priorities.
No permanent free plan published · $19.50/mailbox/mo shown in the published pricing calculator - 02
EasyDMARC
DeliverabilityDMARC, SPF, DKIM, BIMI, and deliverability monitoring.
Adds multi-tenant support over MXToolbox, with nothing given up on these priorities.
Free plan with 1 domain, 1,000 emails/mo, and 14 days of history · EUR 35.99/mo billed annually for Plus - 03
dmarcian
DeliverabilityDMARC management from one of the category specialists.
Adds multi-tenant support over MXToolbox, with nothing given up on these priorities.
Personal plan for non-business use, up to 2 active domains and 1,250 DMARC-capable messages/mo · $24/mo for Basic, or $19.99/mo billed yearly - 04
GlockApps
DeliverabilityInbox placement testing plus DMARC analytics.
Adds multi-tenant support over MXToolbox, with nothing given up on these priorities.
Free plan with 2 Inbox Insight tests once and 10,000 DMARC messages/mo · $59/mo billed annually for Essential - 05
TrulyInbox
DeliverabilityWarmup priced by daily emails instead of connected accounts.
Adds multi-tenant support over MXToolbox, with nothing given up on these priorities.
Free forever for 1 account and 10 warmup emails/day · $29/mo monthly, or $22/mo billed annually for Starter - 06
Warmy
DeliverabilityEmail warmup and deliverability monitoring for sender reputation.
Adds multi-tenant support over MXToolbox, with nothing given up on these priorities.
7-day trial, no credit card, 1 mailbox, 15 to 50 seed emails/day · Paid plan pricing is not exposed in accessible official pricing docs - 07
Postmark DMARC
DeliverabilityFree weekly DMARC digests, plus a paid DMARC Digests upgrade.
Matches MXToolbox on every priority weighed here, so the decision is price and preference.
Free weekly DMARC monitoring with top sources and 7 days of history · $14/mo per domain for DMARC Digests - 08
Mail-Tester
DeliverabilitySimple send-to-test-address spam score checks.
Gives up event stream against MXToolbox and adds nothing on these priorities.
3 tests free within the last 24 hours via the web interface · $50 for 500 tests, or larger prepaid test packs
MXToolbox and its alternatives, side by side
Columns are the priorities teams building autonomous agents weigh, in order. MXToolbox is the first row so the trade in each direction is readable at a glance.
| Provider | Inbound parsing | Idempotency keys | Webhooks | Operating since | Event stream | Best published rate per 1,000 | Batch sending | SDKs | Multi-tenant |
|---|---|---|---|---|---|---|---|---|---|
| MXToolbox | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | No |
| MailReach | No | No | Yes | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| EasyDMARC | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| dmarcian | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| GlockApps | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| TrulyInbox | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| Warmy | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | Yes |
| Postmark DMARC | No | No | No | Not published | Yes | Tiers not published in comparable form | No | None | No |
| Mail-Tester | No | No | No | Not published | No | Tiers not published in comparable form | No | None | No |
MailReach, EasyDMARC, and dmarcian add capability without giving anything up on these priorities. The rest trade one thing for another.