+ Added "Mark read timeout" option in preferences, General tab
+ Added "Popup notification" option with possible values "On every message/Summary/None" in preferences, General tab
+ Added possibility to add custom smiles to SM smiles menu - click ellipsis in smiles menu.
+ Images are displayed in maximum 250x250 size, clicking on image opens it in full size in a new tab.
+ Reply header is configurable: adjust "extensions.fastdial.reply" preference in "about:config" page

Works with Firefox 2.0 - 3.0b5, SeaMonkey 2.0a - 2.0a1Version 2.48:
+ Possibiliy to change encoding of received messages
+ New message font name, size and colour are remembered
+ Main window layout is reverted to the older one
+ Use Ctrl+Enter key combination to send message
+ Several small bugs fixed

Version 2.49:
+ Filters (new tab in preferences)
+ Several small bugs fixed

Version 2.50:
+ Filters: it's now possible to filter messages by size and source
+ Filters: when creating a rule with "contains" condition it's now possible to specify a list of values separated by "," (contains any) or "+" (contains all).
+ Now when message is being deleted from server and isn't found on server, an error message is shown (as previously), but nevertheless message is removed from local storage.
+ New message window now shows font name/size/color of the text under cursor.
+ Link insertion in new window is improved a bit: now it's not necessary to select a block of text to make it s link - a nearest word will be selected automatically.

Version 2.51:
+ Fixed: some messages were displayed blank.
+ Sound without parameters is not "beep", but "mailbeep".
+ Default filter now includes a sound.
+ "Later" button in the return receipt confirmation dialog is movet into middle, because otherwise it was displayed with "No" icon on Linux.

Version 2.52:
+ Added support of multipart/related content type. This means that inline images are now displayed inside message body.
+ If you leave account password empty in preferences, you're asked for a password when you check mail.
+ It's no more needed to click "insert link" button when composing a new message, urls are converted to hyperlinks as you type them.

Version 2.53:
+ It's now possible to show additional colums in folders list: unread/total/size.
+ Count & icon in status bar now display quantity of unread messages in Inbox folder.
+ Different icons for empty/full Trash folder and for folders with unread messages.
+ "Save As" context menu item added
+ "Delete message completely" hint is shown beside "Delete" action
+ "Clear" button for search box added
+ "Counter" action is added.
+ "Account" property added into filter rules, instead of the "To" property.

Version 2.54:
+ Save message as html now saves attachments also
+ Added handling of message/rfc822 content type (used by some mail clients when forwarding messages)

Version 2.55:
+ Message headers are included when printing a message
+ "to Address Book" context menu item
+ Possibility to specify default subject in account preferences
+ "Specify recipient" tooltip when trying to send message with no recipient

Version 2.56:
+ Possibility to show Address Book in main window (check "In main window" checkbox on "Address Book" tab in preferences)
+ New icons in message composition window
+ Bold/Italic/etc. buttons now relect state of text under cursor (this doesn't work on Linux)

Версия 2.57:
+ Added "Select" colum into main window.
+ Button "Save as template" in message composition window
+ Fixed: sometimes connection error wasn't shown

Version 2.58:
+ Groups: it's now possible to create groups of contacts
+ Fixed: "Select" column wasn't working in Firefox 2.x

Version 2.59:
+ When you select group name from autocomplete list in new message composition window, group name is replaced by actual group contents.
+ Added "Favorite" column into Address Book preferences.

Version 2.60:
+ Smiles

Version 2.61:
+ Smiles are now sent as attachments

Version 2.62:
- Possibility to change order of accounts and filters by drag-n-dropping them (in preferences)
- Fixed: Recent contacts menu wasn't shown sometimes
 

Version 2.42:
- Possibility to specify "On mail receive" deletion mode in account preferences.

Version 2.43:
- Return receipt support added: "Return receipt" checkbox added into new message composition window; when message with "Return receipt" request is received a confirmation is show to the user asking if he wants to send return receipt.
- "Print" button on toolbar

Версия 2.44:
- Pressing "Enter" key in message list window now has the same effect as mouse double-click (mark read/unread, download partially downloaded message, open draft message).
- Fixed small error in message parsing.

Version 2.45:
- Added possibility to export/import folder contents into Thunderbird-compatible format.
- Fixed bug: versions 2.43-2.44 had an error - attachments were not sent.

Version 2.46:
- "New" button now has a drop-down with a list of recent contacts
- Fixed: new message composition window wasn't working under FF 3.x
- Fixed: preferences window wasn't displayed when called from "Addons" window.
- Fixed: export of SM preferences wasn't working.

Version 2.47:
- Fonts drop-down in new message composition window now contains all available system fonts.
- "Forward" button now has a drop-down with a list of recent contacts.

Version 2.35:
- Folder and paperclip (for attachments) icons have changed. Icons are taken from free icon set Tango Project.
- Added column "Attachments" showing a paperclip if a message contains attachments.
- Fixed: Ctrl+/Shift+click on an icon was working incorrectly.

Version 2.36:
- Icons instead of labels on toolbar buttons. Icons are taken from Tango Project.

Version 2.37:
- Possibility to mark messages with one of the predefined colors. (Also added column "Color" which may be used to sort messages by color.)
- Fixed highlighting of search text in message body (it no more shows html fragments).
- Added APOP authentication, in particular it allows to use spaces in account passwords.

Version 2.38:
- Preference "Download headers only" on "Advanced" tab in preferences. To download message body double click the message in list or choose "Download" from context menu.
- IMAP: now all messages from Inbox folder are downloaded, not only unread ones.
- Fixed: some SMTP servers have max line length limit, so now line breaks are inserted into long lines.
- "Show new messages in a popup" and "Show errors in a popup" options are disabled on platforms on which Firefox doesn't support showing popup windows.