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DNS SRV Record Lookup for Mail Submission (_submission._tcp)
x402
DNS SRV Record Lookup for Mail Submission (_submission._tcp) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-29).
Resolves SRV records at _submission._tcp.{hostname} for a given registrable domain, returning mail submission server details.
Price / call$0.009
Success—
StatusUnknown
How this service works
Call when an agent needs SRV records at _submission._tcp.{hostname} for mail submission. The caller sends the registrable domain, not the underscored name. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-submission first.
Output
Returns SRV record data for _submission._tcp.{hostname}, including the mail submission server's target hostname, port, priority, and weight as found in DNS.
Example use cases
Discover mail submission server for domain
“What mail submission server and port does gmail.com use? Look up the _submission._tcp SRV records for gmail.com.”
Email client auto-configuration
“I'm setting up an email client for proton.me — can you find the SRV record for mail submission so I know the right host and port to configure?”
Verify email infrastructure for a domain
“Can you check the _submission._tcp SRV records for fastmail.com and tell me what priority, weight, port, and target hostname they publish?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-srv-submission?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to programmatically discover the mail submission server and port for a domain via DNS SRV records, especially for email client auto-configuration, infrastructure auditing, or routing decisions. Prefer the free sandbox endpoint (POST /v1/sandbox/dns-srv-submission) when available to avoid the $0.009 USDC cost.
Side effects
- Domain has no _submission._tcp SRV record in DNS — returns empty or NXDOMAIN result
- Invalid or malformed hostname input — returns validation error
- DNS resolution timeout or upstream failure — returns error response
- Non-registrable or non-existent domain provided — may return no records
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hostname | string | Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name. |
Tags
x402
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