BetterInbox
BetterInbox replaces the default paging Blizzard inbox with a scrollable inbox with some extra features. Summary of invoices, attachments and gold at the top. Dropdown embedded to select what to open, all mail, all items, all gold. Select certain mails via a checkbox and open the selected mails, items or gold.
Curse, WoWInterface
BetterOutbox
Better Outbox is Better Inbox's outbox brother.It adds the following 2 features to the outbox frame: Autocompletion of your alts automatically. Helps when you have non-guilded alts, Autofills the subject if no subject is set and you are only sending money, Autofills the recipient with the last person mailed.
Curse, WoWInterface
CT_MailMod
Adds a several mailing options to your mail window. Mass Mailing: This option allows you to send up to 21 items or stacks of items to the same person with one click. Simply enter their name and add the items, the subject will automatically show each items name. The total amount for sending all mails will be calculated into the upper right of the window, and an optional confirmation box will ensure you know. Each mail will start to send when the previous mail has sent. Adds the ability to Alt+Click item functionality. Alt+clicking an item will add it to both regular mail and Mass Mail screens, as well as to a trade window with another player. A Forward button has been added when reading a mail, which will pull any item out of a mail, put it into your inventory, attach it to a new mail, and send to the specified recipient. In addition to the sending tools, CT_MailMod also adds tools for receiving mail. Adding checkboxes to the left of each message, you can check the ones you would like to open, and hit Open Selected at the top to 'mass-open'. Or if you would like to open all of your mail at once, hit the Open All key. Note that when Open All is pressed, any mail with messages only (no items or coin) will be skipped. Additionally items that are unique will be skipped.
CTMod
DaemonMailAssist
DaemonMailAssist is a mailbox tool that helps with common activities such as grabbing all items and money from your Inbox and providing a To list when sending mail. For your Inbox, DaemonMailAssist allows you to grab items and money from an open mailbox with a single click. You can choose to grab items, money, or both. You can choose to grab from all senders or a specific sender. This is a great tool for AH toons where you are constantly getting items out of your mailbox. For sending message, DaemonMailAssist provides you with contact lists to quickly and easily select a message recipient with a single click. You are provided three lists: guild members, friends, and a recently sent to list. Simply click on a name in any of the three lists and the "To:" field of the message is automatically filled in.
Curse
EasyMail
Modifications to the World of Warcraft mail frame. Remembers the last addressee to whom mail was sent and defaults that name into the addressee field when a new blank mail is displayed. Remembers a user-configurable number of recently-mailed addressees by realm, and allows the player to select from the list to fill in the addressee field by clicking on a drop-down button displayed to the right of the addressee field. If the list is at maximum length, the addressee least recently mailed is removed to add a new addressee. Right-clicking a name in the drop-down list prompts the user to delete that name from the addressee list. Names from the player's friends list and members of the player's guild can be displayed in the addressee drop-down list by setting the appropriate options. Automatically fills in the mail subject line if it is empty when entering money to send. A Take All button is added to the Open Mail window that allows the player to move all the item and money attachments for the open mail into the player's bags with a single click. A Get Attachments button is added to the inbox that allows the user to get all attachments from all mails that have been selected using checkboxes positioned to the left of each mail entry.
WoWInterface, Curse
MassMailer
In-game mail addon that allows you to send mail to groups of characters simply and easily. Especially useful for Guild Leaders, Arena Team Captains, or people with a lot of friends.
WoWInterface
MuleFilter
Create up to 10 filters per server that will automatically send all mail items within a specified criteria to a specified recipient. Criteria can be disenchantables, subcatagorized by rarity or specified item names. All filters created will be listed within the main GUI.
WoWInterface, Curse
Postal
Mail mod that allows quick bulk mailing by filling in the recipient name in the mail frame then alt-clicking items in your bags to send the item. Shift click mail items to collect them directly into your bags. Also allows the user to open all items, or return checked items.
Curse, WoWInterface