v1.40.2-beta.1

1.40.2

Improved

• Opening a mailbox is lighter. Postbox no longer asks the server for
  your guild and friends lists every time, only when you first switch to
  Send, and a burst of new mail is handled once per frame.
• /postbox debug includes performance figures: how long your last few
  mailbox opens took and what the game's own profiler saw, so a slow mailbox
  can be tracked down from one paste.

Fixed

• Baganator bags update when you switch between Mail and Send, so items that
  cannot be mailed are greyed as they should be.

1.40.1

Improved

• Read mail stays in the list, under a divider that waits at the foot of
  a long inbox with Delete all. Click the divider to fold it away;
  Postbox remembers.

Fixed

• No more stray scroll bar on a list that already fits.
• The resize hint no longer reappears while you drag.
• The "Read, nothing left" bar no longer shows mail through it or leaves a
  gap at the bottom.

1.40.0

The biggest Postbox update yet. Every character's mailbox in one place, a
History of everything you collect, and a tidier inbox.
After updating, restart the game once (a /reload is not enough) so Postbox
shows up in the minimap's addon menu.

New

• Every character's mailbox, in one place. Mail Memory remembers what each
  of your characters has waiting. Check any of them from the minimap icon,
  wherever you are, or right in the Mail tab when you are at a mailbox, and
  search all of them at once.
• History. The clock beside Inbox lists everything Postbox collected: when,
  from whom, what it was worth, and what each letter said. It keeps a week, or
  up to a month if you like.
• Warnings before mail is lost. Postbox tells you when mail on another
  character is about to expire, or has been waiting on a character you have
  not played in weeks.
• See new mail before you reach a mailbox. Auctions that sell, expire or
  are bought while you are away show up in Mail Memory by item name.
• From alts. A new button collects everything your own characters sent
  you, on any realm.
• Alt+right-click attaches every stack of an item at once; whatever does
  not fit waits in the queue.
• Postbox speaks Traditional Chinese (繁體中文), translated by samuelbears,
  who also brought us Simplified Chinese. Thank you! If a word reads oddly,
  please say so on GitHub.

Improved

• One tidy inbox. Mail still to collect comes first. Read mail with
  nothing left in it folds away under a divider that deletes it in one click.
  Rather have it elsewhere? Options can give it a tab of its own, or delete it
  for you as you go (History keeps what it said).
• Compact rows by default, lined up in neat columns. You choose what each
  row shows (gold, slots, time left) and in what order; "Larger mail rows"
  brings the two-line rows back.
• Clearer counts. Inbox counts everything in the box, each button counts
  what it would collect, and a button with nothing to do is greyed out.
• Crafted items and reagents show their quality mark on the icon.
• Handy shortcuts: click "Stuck" in the title bar to see only the mail the
  game would not hand over, right-click "Attachments" to empty a mail you are
  writing, and clear a search with one click. "AH Bought" is back, and its
  button now leads the row.
• Faster on big mailboxes and long histories, and the options fit on
  screen again.
• Also: names without the realm, searching "sold" or "AH" finds auction mail,
  Mail Memory can list what expires first and be made wider, the resize grips
  explain themselves, and the new-mail sound and flash work with Mail Memory
  switched off.

Fixed

• The minimap icon's tooltip could say "Nothing waiting" on a character whose
  mail had arrived while it was logged out.
• "Stuck" warnings could appear on mail that was never refused.
• Buying from the auction house played the new-mail alert twice.
• The Postbox Modern look could interfere with other addons' tooltips.
• Mail Memory lost track past 50 mails, and one of its tooltips could cause an
  error.

1.39.0

New

• Postbox speaks Simplified Chinese: every window, message and tooltip,
  translated by samuelbears. Thank you!
• Traditional Chinese still shows English. It needs a translation of its own,
  and contributions are welcome.

1.38.0

New

• The queue is visible. Items waiting to be sent sit in a grid beside the
  attachment slots, in order, and are greyed in your bags. Hover one for
  details, right-click to take it out.
• A run of mails explains itself. Send confirms the run first (mails,
  items, total postage), counts it off as it goes ("Sending 2 of 3..."), and
  says when the game is waiting for your answer about an item.
• Ctrl+Enter sends, from any field.
• Padlocks in EllesmereUI's bags and Baganator on items that cannot be
  mailed, while the Send tab is open.

Improved

• Money has its own column in the mail list: green for gold arriving,
  amber for a C.O.D. price, red for what a won auction cost.
• Time left shows on the row only when a mail is about to go (under three
  days, or under a day for C.O.D.). The tooltip always has it.
• Enter takes a completed name whole, realm included, and Tab moves
  straight to the next suggestion.
• A mail with no subject is titled after its first item, as the game does
  it.
• Also: the totals line is shorter and stays inside the window, resizing is
  free again, and "All bought" is now "All won".

Fixed

• A queued item the game asks about first (a recent purchase you could still
  return) repeated its dialog after the first mail went. It is now asked once,
  on its turn.
• Attached and unmailable items lost their greying in EllesmereUI's bags and
  Baganator after switching tabs.
• The postage shown covered only the first mail of a run.

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Every earlier version is in the full changelog on GitHub.