SMTPing for PHP

Official PHP SDK for the SMTPing email verification API.

• PHP 8.1+, no dependencies beyond ext-curl and ext-json
• Automatic retries on rate limits (429) and server errors (5xx)
• Bulk jobs up to 100,000 addresses, with polling built in

Install

composer require smtping/smtping-php

Create an API key in the SMTPing dashboard. Pass it to the client or set SMTPING_API_KEY.

Verify one address

<?php
require 'vendor/autoload.php';

$smtping = new Smtping\Client(); // reads SMTPING_API_KEY, or new Smtping\Client('sk_live_...')

$r = $smtping->verify('jane@example.com');
echo $r['status'], ' ', $r['band'], PHP_EOL; // valid safe

Every result carries a band field for simple routing:

band	statuses	action
safe	valid, alias	send
avoid	invalid, spamtrap, disposable, blacklisted, complainer, spambot, inbox_full	remove
judgement	catch_all, unknown, role and others	your call

Verify a list

$job  = $smtping->bulk->create($emails);          // ['jobId' => ..., 'status' => ...]
$rows = $smtping->bulk->wait($job['jobId'], [
    'onProgress' => fn ($s) => print(($s['processedEmails'] ?? 0) . PHP_EOL),
]);

// or in one call
$rows = $smtping->bulk->run($emails);
$sendable = array_filter($rows, fn ($r) => $r['band'] === 'safe');

Check a job later with $smtping->bulk->get($jobId) and $smtping->bulk->results($jobId). For a handful of addresses, $smtping->verifyMany([...]) calls the single endpoint for each.

Threat list checks

$smtping->check('spamtrap', 'jane@example.com');
// also: 'disposable', 'spambot', 'complainer'

Credits

echo $smtping->credits()['remaining'];

Errors

use Smtping\Exception\InsufficientCreditsException;
use Smtping\Exception\SmtpingException;

try {
    $smtping->verify('jane@example.com');
} catch (InsufficientCreditsException $e) {
    // top up
} catch (SmtpingException $e) {
    echo $e->status, ' ', $e->getMessage();
}

Classes in Smtping\Exception: SmtpingException (base, with status and body), AuthenticationException, InsufficientCreditsException, RateLimitException, ValidationException, JobFailedException, TimeoutException.

Options

new Smtping\Client($apiKey, [
    'baseUrl'    => 'https://api.smtping.com/api/v1',
    'timeout'    => 60,  // seconds per request
    'maxRetries' => 3,   // network errors, 429, 5xx
]);

Links

• API documentation
• Pricing
• Support: support@smtping.com

MIT License