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Become a Supporter

Help us make Thunderbird better.

MZLA Technologies Corporation is the for-profit organization sustaining the free software mission of Thunderbird. Our work is to provide open source apps that are secure, private and available for users around the world. Your support helps us:

  • Develop new apps, integrations and features
  • Improve the interface, speed, and stability
  • Promote Thunderbird and software freedom
  • Serve millions of free app downloads each year

Not tax deductible as a charitable donation

Frequently Asked Questions

Contact us

Questions about donating? See common answers below. If you still need help donating, please contact us via this form.
Want to provide product feedback? Head over to Mozilla Connect.
Need product or technical support? Visit our knowledgebase and community support forum.

What are the ways I can give?

You can donate online securely by credit card or PayPal, Google Pay, Apple Pay, and by bank transfers through SEPA, iDEAL and ACH.
Give in your local currency! We accept over 100! Choose yours from the drop down menu next to ‘Amount’.
You can give offline in USD only by mailing a check or money order made payable to "MZLA Technologies Corp". Mail to:

  • MZLA
  • PO Box 25718
  • Pasadena CA 91185-5718

Please include your email address on the memo line of your check to help us track and attribute your gift. We can only send acknowledgement receipts by email.

Give the gift of your time! If you would like to learn how to contribute to Thunderbird in other ways such as coding, translating or testing, please visit our Participate page.

How do I cancel or change my recurring gift? Can I change my payment method or my donation frequency?

Access your plan details from the Donor Portal or from the 'Manage My Donation' button on your recent donation confirmation email. You can change the amount, frequency, payment method and charge date. You can also cancel your recurring plan and download your receipts.

Does my gift give me access to tech support?

All Thunderbird technical support is community-based and available to everyone. Visit our support forum. We do not provide individual tech support in exchange for financial gifts.

How do I get a receipt?

You will receive an email confirmation whenever you donate and this will include a receipt for your records. You can also access your receipt history at any time from our Donor Portal.

Is my gift tax deductible?

Gifts to Thunderbird are not tax-deductible as charitable gifts, but are greatly appreciated!
Giving to Thunderbird supports the development of open source apps that are secure, private and available for users around the world. Your support also ensures that our core apps remain free for everyone.

Why do you need my address in order to process a gift?

We understand that your privacy is very important -- we agree, and that's a core value of ours at Thunderbird and Mozilla. Your address is part of our Payment Processing, Contact and Donation Information that we outline in our Privacy Policy. This data is used for payment processing, transactional receipts, fraud detection and record-keeping purposes. If you want to know more about the personal information data we receive, the third-party vendors we trust, and how long we keep your data, please refer to our Websites, Communications & Cookies Privacy Notice.

How can I turn off the donation message on the Thunderbird start page?

To learn how to customize your start page please visit:
https://support.mozilla.org/kb/how-disable-or-change-thunderbird-start-page

How can I get a business receipt?

When you donate via our online form, simply check the box 'Donate as an Organization' and include your company name. Your transaction receipt will include your company name. If you need a copy of your receipt, download from our Donor Portal.

Is my donation secure?

Yes, we use industry-standard SSL technology to keep your information secure. We partner with Stripe, the industry's established payment processor trusted by some of the world's largest companies. Your sensitive financial information never touches our servers. We send all data directly to Stripe's PCI-compliant servers through SSL. We understand that your privacy is very important. For complete information please refer to the Mozilla Privacy Policy.

Can I request a refund?

Your donation may be eligible for a refund. You must contact us within 15 days of payment date. If you believe this payment was made without your authorization, please contact us immediately. Donations made via ACH or SEPA direct debit are ineligible for refunds. Due to the nature of these transactions our policy prioritizes minimizing refund fraud. We appreciate your understanding. If you need assistance, please contact us.

Are there additional fees added to my donation?

We do not collect any additional fees or taxes. When you donate in your local currency you are not charged a conversion fee by your credit card. You can choose to also cover the payment processing transaction costs. This is completely voluntary and you may opt in or out using the checkbox on our donation form. Our organization is based in the United States. We encourage donors to research any additional external taxes or fees that may be applied by regulators such as your bank or tax authority.

What do the transaction costs cover?

When you opt to cover our payment transaction costs, you're covering both our payment processing and donation platform fees. The costs associated with our robust online donation system allows us to continue scaling sustainably as our supporter-base grows. Our donation platform and payment processor partners reduce internal costs associated with maintaining our own system from scratch. Our partners ensure we can accept a wide range of currencies/payment methods and remain PCI compliant in all of the countries that we accept gifts from. The transaction costs you may choose to cover are based on an estimate of our overall costs. Due to many factors actual costs may fluctuate.

Why do one-time donations appear as recurring in the SEPA mandates?

When making a one-time gift through SEPA direct debit, you may notice a mention of recurrent transactions. This is because our payment processor Stripe only supports recurring transactions for this type of payment. Regardless of this, we will only charge you once and we will not make any further payments on your account without your authorization. Following the mandate, you will receive an official donation receipt that will clearly reflect the one-time donation.

Can I give in cryptocurrencies?

No. We are not currently accepting cryptocurrency gifts.

How will my gift be used?

Thunderbird is the leading open source email and productivity app that is free for business and personal use. Your gift helps ensure it stays that way, and supports ongoing development.

What is Thunderbird’s relationship to MZLA Technologies Corporation?

MZLA Technologies Corporation is a wholly owned for-profit subsidiary of the Mozilla Foundation and the home of Thunderbird.

Doesn’t Thunderbird earn income?

Currently, nearly 100% of Thunderbird’s operating revenue comes from the generous gifts of Thunderbird users.

Become a Corporate Supporter

Secure an open future for yourself and the world.

Organizations deploying Thunderbird at scale or who share our passion for expanding digital freedoms can make a difference by becoming a one-time or recurring corporate supporter. Small to medium size contributions can be made with the form above. For contributions greater than $5000 USD please contact our business team. Thank you in advance for your generous support!

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