Spark is an email client which allows users to connect to an unlimited number of IMAP or EWS email accounts. Whenever you check your inbox, Spark contacts the server to connect you with your messages. When you read an email message, you aren 't actually downloading or storing it on your device; instead, you’re reading it off of the server.
Spark doesn’t backup emails. Therefore, emails cannot be stored locally: all the emails are located on the IMAP server and Spark provides you with access to it.
Meanwhile, Spark caches emails and attachments over the past month when connected to Wi-Fi, so that you can later look through your Inbox even offline. Cached emails can’t be saved locally as well, which means you can’t open them in a separate file, or you won’t be able to move/copy them while you don’t have access to the server.
Note: Your device should be connected to the Internet in order to take account. While offline, you can read cached emails only.
The content of the emails you send and receive is stored on the server of your email account (Gmail, Outlook, Yahoo, etc.).
At the same time, such unique features as Teams (shared emails and comments, shared drafts, shared links, delegation), Templates and Send Later require the support of our servers and your emails corresponding to these features are safely stored there in an encrypted form.
If you have any questions or concerns about your personal data storage, please check out our blog article “Spark Email Privacy: Everything you Need to Know”.Read next: Connect Other Productivity Apps to Spark