Add-ons
Mass Emailer 2.0.1
by PxDe
MassEmailer is a marketing email campaign manager for Thunderbird that helps you send bulk emails with rate limiting and features that include customizable templates, contact list management, campaign scheduling, all while respecting email servers.
About this Add-on
RENOVATED APP 2.0 IS UP NOW!!
Mass Emailer Send professional email campaigns directly from Thunderbird, with full control to avoid server blocks.
Key Features:
How It Works:
Known Issues:
Mass Emailer Send professional email campaigns directly from Thunderbird, with full control to avoid server blocks.
Key Features:
- Control outgoing rates to avoid being flagged as spam
- Send bulk emails using your Thunderbird accounts
- Manage up to 6 active campaigns
- Import recipient lists and use dynamic placeholders (e.g.
{{name}}{{email}}{{company}}) - Send emails with rotating subject lines
How It Works:
- Install the add-on and create your first campaign to open the Campaign Manager. It has three sections: Templates, Send Options, and Recipient List.
- TEMPLATE
- Explore your Thunderbird folder tree to find the email you will use as a template, then assign it to the campaign.
- If you are using placeholders, make sure they match your uploaded recipients table (e.g.,
{{name}}↔ columnname; To:{{email}}↔ columnemail). However, BLANK recipient in your template will work too. - Once confirmed, you will see a preview of your email and the detected placeholders.
- SEND OPTIONS
- Choose whether to send now or later (sending later places emails in your Outbox).
- Set your sending rate (e.g., emails per hour).
- Enable Random Mode to introduce time variation (e.g., if sending 1 email every 10 seconds, actual interval will vary between 6–18 seconds).
- Enable Logic Mode to create batches with cooldowns (e.g., 25 emails per batch with a 5-minute pause).
- To send hundreds or thousands of emails, combine Sending Rate + Random Mode + Logic Mode. Optionally activate multiple subject lines.
- “Send now” uses its own timing between emails. Use only the Thunderbird engine if the app doesn’t work correctly for you or if you don’t mind stricter server limits.
- RECIPIENTS
- Import recipients from CSV or Excel (first row becomes column headers used as placeholders in your email body).
- Once your recipients are loaded, check the TEMPLATE section for placeholders; matched placeholders will turn green in the preview.
- Click Run Campaign to start sending.
Note: Using Microsoft Email Essentials, we successfully delivered 500 emails in one run with a rate of 260/hour, using Random + Logic Mode (25-email batches with 5-minute cooldowns).
Known Issues:
- During Full Activation, if you import hundreds of emails, the app may show only 50 recipients; however, when running the campaign it will send to the entire list comprising your hundreds of emails.
