tt-rss.github.io/docs/Email-Digests.md

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Users may opt into receiving daily (sent once every 24-hours) digests of unread headlines via email.

Digests are sent out by the update daemon or if running update.php —feeds manually. At most 15 messages are sent in one batch.

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PHPMailer plugin is required to send mail under Docker.

• Digests may be customized by editing templates/digest_template*.txt.
• You can preview your digest contents in preferences.