Sendmux
Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.
Whois information
| Domain | sendmux.ai |
|---|---|
| Registrar | Cloudflare, Inc |
| Created | 02/16/2026 |
| Expires | 02/16/2028 |
| Updated | 08/12/2026 |
| Domain status | client transfer prohibited |
| DNSSEC | Signed |
| Registrant country | 🇦🇺 Australia |
| Name servers | jobs.ns.cloudflare.comnelly.ns.cloudflare.com |
SEO audit
15 of 16 checks passed95
SEO score
Response 839 ms · 166 KB
- Served over HTTPS
- Title tag present
- Title length 30 to 60 characters
- Meta description present
- Description length 70 to 160 characters
- Exactly one H1 heading
- Uses H2 sub-headings
- Canonical URL set
- Mobile viewport tag
- Language declared
- Open Graph tags
- Twitter card tags
- Structured data (JSON-LD)
- Images have alt textAdd alt text to 5 images.
- At least 300 words of content
- Responds in under 1.5 seconds
- Title (51 characters)
- Sendmux - The Email API for AI Agents, with Inboxes
- Description (153 characters)
- Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.
- Headings
- 1 H1, 10 H2, 31 H3
- Words on page
- 2,009
- Links
- 38 internal, 11 external
- Structured data
- Organization, WebSite, FAQPage
On-page keywords
| Phrase | Type | Mentions |
|---|---|---|
| example net | Two words | 11 |
| api key | Two words | 10 |
| message received | Two words | 10 |
| event message received | Three words | 5 |
| sarah example com | Three words | 4 |
| example com subject | Three words | 4 |
| sendmux | Word | 38 |
| mailbox | Word | 33 |
Tech stack and pricing
Lowest paid plan
$0.0005 /month
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About Sendmux
What is Sendmux?
Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.
How much does Sendmux cost?
Paid plans start at $0.0005 per month, based on the public pricing page.
What are the best Sendmux alternatives?
Popular alternatives in October 2026 include Cloudflare: Build for the agent era, Search - Microsoft Bing, ChatGPT, Sentry.