| Mozilla autoconfig | Email address of email accounts | Upon configuring an email account |
| Email server | Login credentials, messages sent | Upon configuring and using an account or identity and upon sending messages |
| ipinfo.io | IP (network) address of domain names of links or email addresses | Upon pressing a button in the link confirmation dialog |
| Spamhaus | IP (network) address of domain names of links or email addresses | If spam blocklists are enabled, upon receiving a message |
| Spamcop | IP (network) address of domain names of links or email addresses | If spam blocklists are enabled, upon receiving a message |
| Barracuda | IP (network) address of domain names of links or email addresses | If spam blocklists are enabled, upon receiving a message |
| DeepL | Received or entered message text and target language code | If translating is enabled, upon pressing a translate button |
| LanguageTool | Entered message texts | If LanguageTools is enabled, upon long pressing the save draft button |
| Gravatar | [MD5 hash](https://en.wikipedia.org/wiki/MD5) of email addresses | If Gravatars are enabled, upon receiving a message (GitHub version only) |
| Libravatar | [MD5 hash](https://en.wikipedia.org/wiki/MD5) of email addresses | If Libravatars are enabled, upon receiving a message (GitHub version only) |
| GitHub | None, but see the remarks below | Upon downloading Disconnect's Tracker Protection lists |
| | | Upon checking for updates (GitHub version only) |
| BIMI | Domain name of email addresses | If BIMI is enabled, upon receiving a message |
| Favicons | Domain name of email addresses | If favicons are enabled, upon receiving a message |
| Link title | Link address | Upon pressing a download button in the insert link dialog |
| Bugsnag | Information about warnings and errors | If error reporting is enabled, upon detecting an abnormal situation |
| Service/function | Data sent | When the data will be sent |