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WordPress SMTP with reliable email delivery

Scale your outbound communication by connecting high-deliverability email engines and secure authentication protocols to your CRM. Effortlessly configure API tokens, OAuth 2.0 access, or custom SMTP parameters while maintaining total control over your domain records. Experience real-time event tracking, automated failure diagnostics, and reliable delivery for all your customer touchpoints.

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SMTP delivery highlights: active route, deliverability, throughput, and protocol
Connect secure outbound mail providers

Connect secure outbound mail connections through custom protocols easily

Streamline your email delivery by choosing from a variety of secure connection protocols tailored to your system. Easily configure high-throughput API keys, direct cloud integrations, or traditional outbound SMTP relays with zero complex coding required. Maintain total control over your deliverability rates while keeping your sending domain credentials fully protected.

Select your preferred integration protocol to route outbound emails

Streamline your email delivery by choosing from a variety of secure connection protocols tailored to your system. Easily configure high-throughput API keys, direct cloud integrations, or traditional outbound SMTP relays with zero complex coding required. Maintain total control over your deliverability rates while keeping your sending domain credentials fully protected.

SMTP, HTTP API, and cloud SMTP protocol options

Configure your email connection in minutes

Select an email provider and add a connection
1

Enter a unique name for your connection

Begin by defining a recognizable internal name for your email integration setup inside DoubleScale. This label helps you easily identify and manage this connection later within your account dashboard.

Authenticate domain and IP for SMTP
2

Choose your email delivery service provider

Select your preferred email provider or custom SMTP server from the available interactive integration grid. Pick the exact service that handles your outbound transactional messages to automatically configure protocol parameters.

Complete SMTP configuration
3

Authenticate account credentials & API keys

Enter your provider account details, secret API key, and server region to establish authentication. Save these credentials securely so DoubleScale can safely communicate with your external email server infrastructure.

Monitor SMTP email activity
4

Configure default sender email & name

Set your official sender email address and display name to personalize outgoing messages for recipients. Finalize your settings and save the connection to complete integration and start routing emails.

Fast outbound email dispatcher

Guarantee inbox placement with test dispatches

Safeguard outbound campaigns by sending real-time test emails through your configured providers to evaluate dispatch speeds and server acceptance. Keep messaging workflows running reliably by running instant deliverability checks whenever you update your credentials.

Review complete message history across all connected providers

Gain full visibility into email delivery performance using comprehensive diagnostic logs and status tracking. Identify bounce triggers and inspect detailed server payloads to keep all messages in optimal inbox placement.

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Complete SMTP message history table
FAQ

Frequently asked questions

Everything you need to know about DoubleScale before you start.

What is DoubleScale?

DoubleScale is a self-hosted CRM plugin for WordPress. It combines contact management, sales pipelines, email campaigns, SMS, WhatsApp, booking, invoices, and support tickets inside your WordPress dashboard, with data stored on your server.

Is DoubleScale self-hosted?

Yes, DoubleScale is 100% self-hosted. Your data never leaves your server. Unlike SaaS tools such as Mailchimp or ActiveCampaign, contacts, campaigns, and pipeline data stay in your WordPress database, so you keep ownership and control.

Does DoubleScale slow down my website?

DoubleScale stores CRM data in its own database tables, separate from your post content. The admin app is a single-page interface, so the public website is not loading the CRM UI on every visit.

Are there any limits on contacts or emails?

No. DoubleScale does not cap contacts, campaigns, or pipelines by plan. You can store unlimited contacts and send as many emails as your SMTP provider allows, without a per-contact fee.

Does DoubleScale work with WooCommerce?

Yes. DoubleScale syncs WooCommerce customers and orders into CRM contacts so you can segment, email, SMS, or automate from store activity without a separate ecommerce CRM.

Can I send WhatsApp messages from WordPress?

Yes. DoubleScale includes WhatsApp marketing through the Meta API, so you can message contacts and trigger automations from WordPress.

Is DoubleScale a Mailchimp alternative?

DoubleScale is a WordPress CRM with email campaigns, plus SMS, WhatsApp, pipelines, booking, and helpdesk, running on your own server. Mailchimp is hosted email marketing. If you want CRM and email inside WordPress, DoubleScale is the closer fit.

Does DoubleScale include a helpdesk?

Yes. DoubleScale includes support tickets and a customer portal so customers can open and reply to tickets on your site. Internal notes stay hidden from customers.

How much does DoubleScale cost?

Plans start at $99 per year for one website, with unlimited contacts and seats. Plus and Enterprise cover more sites. Lifetime licenses are listed on the pricing page.

Can I try DoubleScale before buying?

Yes. DoubleScale has a live demo on doublescale.io, and the plugin is listed on WordPress.org so you can review features before choosing a paid plan.

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Run your whole business from WordPress

Start with the free plugin and add Pro modules when you need them. Unlimited contacts on every plan, and your data stays on your own server.

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