Downloading only email headers instead of full messages can indeed help manage data usage, which is beneficial for users with limited data plans or those who are mindful of their data consumption. Full message body and attachments are only downloaded when the user selects a specific email, thus conserving data by not automatically downloading potentially large amounts of unneeded data. This contrasts with full message synchronization, which would consume more data as it downloads the entire content of all emails.
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What are email headers?
How does the synchronization setting affect mobile data usage?
What is the difference between header-only sync and full message sync?