Frequently Asked Questions

Thunderbird is a project of MZLA Technologies Corporation, which is a wholly owned subsidiary of Mozilla Foundation.

Visit this link to make a secure online donation right now via credit card or PayPal.

We understand that your privacy is very important. We ask for a minimum amount of information required to process credit card payments, including billing addresses. This allows our payment processor to verify your identity, process your payment, and prevent fraudulent charges to your credit card. We keep your information private — if you have questions, please refer to our Privacy Policy. If you would rather not fill in your information on our online form, you can mail us a check.

We are not currently accepting bitcoin.

The start page appeal to donate can’t currently be turned off. If you like, you can change the start page to something else. To do this, in Thunderbird go to Options | General

Thunderbird is the leading open source cross-platform email and calendaring client, free for business and personal use. Your gift will help ensure it stays that way, and will support future development.

Currently, the majority of Thunderbird’s revenue comes from generous gifts from users and friends of Thunderbird.

Anyone can give, companies and individuals, to Thunderbird to support development of the product now and in the future.

Anyone can access tech support for Thunderbird by visiting the support forum. Thunderbird does not provide tech support or enhanced tech support in exchange for financial gifts.

Gifts to Thunderbird are not tax-deductible, but are greatly appreciated. Giving to Thunderbird supports the development of our leading open source cross-platform email and calendaring client, free for business and personal use. Your gift will help ensure it stays that way, and will support future development.

If you used PayPal to set up a recurring gift, you’ll need to log in to your PayPal account to make changes or to cancel. If you made a monthly gift using your credit card, please contact to the Donor Care team via this form. Please include the email address and name you used to make your donation, and they’ll try to help you within two business days.

If you have a question about giving to Thunderbird, please contact us via this form. We will do our best to follow-up with you as soon as we can. If you need technical support, please head over to Thunderbird Support for assistance.