Verifly Tool

Verifly is an agent-native email verification API. It tells you whether an email address is real and safe to send to — checking deliverability (syntax, domain, MX, SMTP) and risk flags (disposable, role, catch-all, free provider) — and returns a verdict with a send / do-not-send recommendation.

This tool lets a LlamaIndex agent verify an address before adding it to a list, confirming a signup, or firing off a message.

Installation

pip install llama-index-tools-verifly

Getting an API key

Create an account and grab a key at verifly.email. Verifly is built for autonomous workflows, so an agent can also self-onboard for a key (with free starter credits) and no human in the loop via the autonomous registration endpoint. Set it as an environment variable:

export VERIFLY_API_KEY="vf_..."

Usage

from llama_index.tools.verifly import VeriflyToolSpec
from llama_index.core.agent.workflow import FunctionAgent
from llama_index.llms.openai import OpenAI

verifly_tool = VeriflyToolSpec(api_key="vf_...")  # or rely on VERIFLY_API_KEY

agent = FunctionAgent(
    tools=verifly_tool.to_tool_list(),
    llm=OpenAI(model="gpt-4o"),
)

await agent.run("Is lead@example.com a deliverable email address?")

Call it directly:

from llama_index.tools.verifly import VeriflyToolSpec

verifly_tool = VeriflyToolSpec()  # reads VERIFLY_API_KEY from the environment
doc = verifly_tool.verify_email("lead@example.com")

print(doc.text)            # e.g. "lead@example.com: deliverable - recommendation: send"
print(doc.metadata)        # full structured result: is_valid, result, reason, details, ...

Available Functions

verify_email: Verify a single email address. Returns a Document whose text is a short human-readable verdict and whose metadata holds the full structured Verifly result (is_valid, result, reason, details, recommendation, credits).

This loader is designed to be used as a Tool in an Agent.