RustBox

Appearance

Personalize RustBox without changing mail behavior.

Language Theme Interface styleRustBox is fully customizable: colors, spacing, panes and typography. Color preset Accent color

#6f9c86

Custom background

#121513

Custom panel

#181c19

Custom text

#edf0ec

Density Preview pane UI size Font family Font size 13 px Message row height 58 px Folder pane width 228 px Message pane width 420 px Corner radius 4 px Contrast Date format Time format

Show avatars Show attachment icons Show flags Reduce motion

Advanced interface styling

Icon size 18 px Toolbar density Sidebar item height Reader max width Composer width 900 px Selection color

#28352e

Unread weight 730 Unread marker Scrollbar

Compact message headers Show panel borders Monochrome interface

Folder background override Message-list background override Reader background override

Mailbox

Control message-list and reader behavior for this account.

Messages per page Mark as read Remote images Message body Threads Default sort

Collapse quoted text where possibleShow message snippets in the listKeep flagged messages on top by defaultSynchronize RustBox labels as IMAP keywords

Keyword synchronization is used only in folders whose IMAP server advertises persistent custom flags. Local labels remain available everywhere.

Composing

Defaults for new messages and draft behavior.

Default format Autosave interval Default priority Default message font Reply position Quote style Forward button

Request read receipt by default Warn when message text suggests a missing attachment Use browser spellcheck while composing Maximum attachment size__RUSTBOX_MAX_ATTACHMENT_MB__ MiBPer-file upload limit set with max_attachment_size_mb in rustbox.toml. Maximum message size__RUSTBOX_MAX_MESSAGE_MB__ MiBHard limit for the complete RFC822/MIME message sent to the MTA, including base64/MIME overhead.

Markdown is stored as source text and sent as a safe rendered HTML alternative with a plain-text fallback.

Saved responses

Reusable text or HTML responses, compatible with the Roundcube canned-response workflow.

No saved responses.

Folders

Choose special IMAP folders used by RustBox. Values are stored per account.

Sent Drafts Trash Default spam destinationShared by all accounts in this browser when that folder exists. Spam destination override (this account)Leave automatic to use the default above, then IMAP Junk/Spam auto-detection. Archive

Sent, Trash, Spam/Junk and Archive are used directly by mail actions. The spam destination resolves in this order: account override → browser default → IMAP Junk/Spam auto-detection.

Mailbox storageLoading quota…

Identities & signatures

Sender identities and account-wide signatures. Editing opens in a dedicated window so the form never collides with Settings.

Configured identitiesSelect an identity to edit its sender data, text/HTML footer, image and OpenPGP defaults.

OpenPGP

Manage per-user keys, trust and discovery. Private keys never leave the server unless you explicitly export one.

Policy & discovery

Discover keys with WKD Fallback to configured HTTPS key server Encrypt only to trusted keys

Generate key

Name Email PassphraseNot stored by RustBox.

Import / discover

Armored public/private key Initial trust

Discover by email

Keyring

No keys loaded

Notifications

Desktop notifications Sound for new mail and calendar reminders Do Not Disturb

DND fromDND until

Folders

Browser permission: unknown

ManageSieve filters

Not checked

Scripts

Script name

Rules in this scriptExisting # rule:[name] filters and RustBox rules are parsed automatically.

0

No rules found in this script

Rules are edited in a separate visual window with a live “what will happen” preview.

Autoresponder / vacation

Subject Reply interval (days) Active from Active until Message Skip mailing lists Skip automated messages

Advanced Sieve source

Use this only for syntax the visual editor does not understand. Parsed rules stay editable above.

Diagnostics

Live capability checks for the current account. Credentials and server host names are not returned to the browser.

IMAPNot checked

SMTPNot checked

ManageSieveNot checked

RealtimeDisconnected

IMAP IDLE events are delivered to the browser through the RustBox WebSocket connection.

Synchronization cacheNot checked

Search indexNot checked

Account

Accounts signed in to this RustBox browser session.

Active sessions

Live RustBox sessions for this account, including other browsers while the server is running.

RustBox __RUSTBOX_VERSION__

Webmail based on the Oxi codebase, with a RustBox-owned interface compiled into the Rust executable.

Upstream: c0h1b4/oxi
Oxi base: __RUSTBOX_OXI_BASE__
Frontend: HTML, CSS and vanilla JavaScript embedded at Cargo build time
Author: @linuxiarz.pl
Repository: git.linuxiarz.pl/gru/RustBox