Summary

Love the export tool and use it for regular business backups. Two small additions to the CLI would make it significantly more practical for recurring and domain-scoped use cases: a --since flag to limit exports to a recent time window, and a --filter-domain flag to scope exports to a specific email domain.

Proposed Flags

--since DATE

Export only messages on or after a given date (ISO 8601).

./proton-mail-export-cli --operation backup --dir ./backup --since 2026-03-01

--since is the established convention for this pattern across tools like git log, journalctl, and most backup utilities, making it immediately intuitive.

Why it matters: Without this flag, every run re-scans and re-downloads the entire mailbox. On a large inbox a full export can take hours. With --since, a weekly backup of a busy inbox downloads tens of messages instead of thousands — making scheduled backups fast and storage-efficient.

--filter-domain DOMAIN

Export only messages where at least one address field (From, To, CC, BCC) matches the given domain.

./proton-mail-export-cli --operation backup --dir ./backup --filter-domain company.com

Why it matters: Users managing multiple identities or custom domains have no way today to produce a focused archive without post-processing. A single flag makes compliance exports and domain-scoped backups first-class workflows.

Thanks a bunch in advance for your consideration!