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Web client

Mail

Feature Notes
Message list Condensed or expanded (Settings → General). Hover a row for archive, delete and read/unread. x selects.
Bulk actions Select some, all, or the whole folder; archive, delete, report, mark, move or label.
Inbox categories General, Offers, Communities, Notifications, Forums. Learns from your moves. Stored as $cat_* keywords.
Labels and folders Drag a conversation onto a folder to move it, onto a label to apply it.
All mail Every message outside Trash and Junk.
Shared folders Share with colleagues or the whole domain: read, read and file, or read/file/delete. Visible over IMAP under Shared/<owner>/.
Import and export mbox or .eml per folder; single messages as .eml.
Snooze Returns unread to its folder. Moving it out of Snoozed cancels it.
Unsubscribe One-click (RFC 8058) where supported, otherwise by mail or the sender's page.
Attachment previews Images, text and PDF (pdf.js, no scripts).
Block sender Their mail goes to Junk. Whole domains in Settings.

Search

Searches subject, addresses, body and attachment names. Trash and Junk are excluded unless you use in:. Supports Gmail operators:

from: to: cc: bcc: subject: filename: label: category: in:<folder> in:anywhere
has:attachment is:unread is:starred before: after: older_than: newer_than:
larger: smaller: -word OR

Spam

  • Report spam / Not spam train your personal filter and the server's Rspamd.
  • The personal filter acts after 10 spam and 10 wanted messages, and only on scores ≥ 0.9.
  • Senders that pass verification are never filed away by it.
  • Review or reset it in Settings → Inbox.

Filters

Settings → Filters edits server-side Sieve scripts as rules or raw Sieve. Rules match headers, text or size, and move, copy, label, mark, forward or delete.

Writing

Feature Notes
Identities Name and reply-to per address. An identity can send through its own SMTP server.
Masked addresses A random address per website.
Signatures Several per account; separate defaults for new mail and replies.
Templates Inserted from the composer toolbar.
Undo send 5 seconds by default, up to 30.
Scheduled send Up to 30 days ahead. Listed under Scheduled.
Read receipts Request or send (RFC 8098).
Spell check Browser dictionaries.

Masked addresses

Settings → Masked addresses creates a random address delivered to your mailbox.

  • Set a description, website, prefix, domain and expiry. The address and expiry can't change.
  • Disabled, expired or deleted masks reject mail, even on catch-all domains.
  • Replies are sent from the mask the message arrived at.
  • Mask integrations issues 90-day tokens for password managers. See the API.

AI

Needs a model configured under Administration → Models. Content goes to the provider only when you request an action. Encrypted messages are never sent.

Feature Notes
Summarize Key points and requested actions.
Translate Offered when the message's language differs from yours. Chrome and Edge can translate on-device without a model.
Smart replies Up to three editable drafts. Toggle in Settings → Inbox.
Summary cards Orders, bookings and bills, merged across related messages. Structured data is read without AI.

Security

  • Sender checks. Hover the sender to see SPF, DKIM, DMARC and TLS results. Failures show a warning.
  • Sender pictures. BIMI logos for DMARC-enforcing domains (check mark with a VMC), otherwise Gravatar.
  • Links and attachments. Deceptive links and executable attachments ask before opening.
  • Remote images. Blocked until allowed, then loaded through the server's proxy.
  • OpenPGP. Keys live in the browser. Optionally encrypt all incoming mail to your key.
  • S/MIME. Import a .p12 in Settings → Security; the server signs, encrypts and decrypts.

Calendar and contacts

  • Contacts (/contacts): groups, vCard import/export, recipient suggestions (including LDAP).
  • Calendar (/calendar): multiple calendars, tasks, recurring events, iCalendar import/export.
  • Invitations are mailed to guests; replies update the event.
  • Sharing: read or edit, within the domain.
  • Reminders appear only while the web client is open.

For programs, see CalDAV and CardDAV.

Account

  • Multiple accounts: up to five per browser, switched from the account menu.
  • Notifications: Web Push, also with no tab open.
  • Usage: quota and hourly sending limit in Settings → General.
  • Languages: 20, following the browser. Strings are in web/src/locales/<code>.json.
  • Skins: six built in, more from the administrator, including theme packages.
  • Add-ons: plug-ins the administrator made available, turned on per user in Settings → General. They can add buttons, views and pages, or hide some built-in features. See Plug-ins and themes.

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