# DNS SRV Record Lookup for POP3S (_pop3s._tcp)

> DNS SRV Record Lookup for POP3S (_pop3s._tcp) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-02).

Returns SRV records at _pop3s._tcp.{hostname} for locating POP3 over TLS mail servers for a given domain.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-pop3s?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-srv-record-lookup-for-pop3s-pop3s-tcp-4e7a2aaa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O22hHzS2d815U2T3qjibh

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability dns-srv-record-lookup-for-pop3s-pop3s-tcp-4e7a2aaa -d '<json body>'
```

Example prompt: Can you look up the POP3S SRV records for example.com so I can find out which server and port handle secure POP3 mail for that domain?

## When to prefer this

Use this endpoint when an agent needs to discover POP3 over TLS (POP3S) mail server configuration for a domain via DNS SRV records. Choose this over manual DNS queries when you have only the registrable domain name (not the underscored SRV name) and need a managed lookup. Prefer the free sandbox endpoint (/v1/sandbox/dns-srv-pop3s) when available; use this paid endpoint for production use cases requiring reliable resolution.

## Known failure modes

- Domain has no _pop3s._tcp SRV record — returns empty result
- Invalid or malformed hostname input — validation error
- DNS resolution failure or timeout — service error
- Hostname exceeds 253 character limit — input rejected
- Payment not provided or insufficient — HTTP 402 response

## How this service works

Call when an agent needs SRV records at _pop3s._tcp.{hostname} for POP3 over TLS. The caller sends the registrable domain, not the underscored name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-pop3s first.

## Output

Returns SRV record data for _pop3s._tcp.{hostname}, including priority, weight, port, and target hostname of the POP3 over TLS mail server. If no records exist, the response will indicate an empty or not-found result.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hostname": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dns-srv-record-lookup-for-pop3s-pop3s-tcp-4e7a2aaa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)