sorry, no.  the mail window is read only at the moment.

It takes a few simple changes to make it so that you can take mail from the 
ArkInventory Mail frame. Other changes are needed to make the ArkInventory Mail 
frame appear when the standard mail frame is opened.


In ArkInventory.lua, make the following two changes:

- add a line in the definition of "[ArkInventory.Const.Location.Mail] = {"

            template = "ARKINV_TemplateButtonMailItem",


- add a function:

function ArkInventory.Frame_Mail_Item_OnMouseUp( frame, button )

    if ArkInventory.ValidFrame( frame, true ) == false then
        return
    end

    local loc_id = frame.ARK_Data.loc_id
    local i = ArkInventory.Frame_Item_GetDB( frame )

--  print( "Mail Mouseup msg:" .. (i.msg_id or "nil") .. " attachment:" .. 
(i.attachment_id or "nil") .. " link:" .. (i.h or "nil") )

    if IsModifierKeyDown( ) then

        if i.h then
            HandleModifiedItemClick( i.h )
        end

    elseif ArkInventory.Global.Mode.Edit then
--      print("edit")
        ArkInventory.MenuItemOpen( frame )
    else
--      print("taking item")
        TakeInboxItem(i.msg_id, i.attachment_id)
    end

end


In ArkInventory.xml, add a button:

    <Button virtual="true" name="ARKINV_TemplateButtonMailItem" inherits="ARKINV_TemplateButtonItem" hidden="true">

        <Scripts>

            <OnClick>
                -- do nothing
            </OnClick>

            <OnDragStart>
                -- do nothing
            </OnDragStart>

            <OnReceiveDrag>
                -- do nothing
            </OnReceiveDrag>

            <OnMouseUp>
                ArkInventory.Frame_Mail_Item_OnMouseUp( self, button )
            </OnMouseUp>

        </Scripts>

    </Button>


In ArkInventoryStorage.lua, make the following changes to ArkInventory.ScanMail:

- move the following to before "if not bag.slot[slot_id] then"

                    local h = GetInboxItemLink( msg_id, attachment_id )

- add the following lines after "slot_id = slot_id,"

                            msg_id = msg_id,
                            attachment_id = attachment_id,

- add the following lines to before the "end" statement of "if not 
bag.slot[slot_id] then"


--                      print("Added loc:" .. loc_id .. " bag:" .. bag_id .. " slot:" .. 
slot_id .. " msg:" .. msg_id .. " attachment:" .. attachment_id .. " link:" .. 
(h or "nil"))
                    else
                        if bag.slot[slot_id].msg_id == msg_id and bag.slot[slot_id].attachment_id == attachment_id then
--                          print("Skipped loc:" .. loc_id .. " bag:" .. bag_id .. " slot:" .. 
slot_id .. " msg:" .. msg_id .. " attachment:" .. attachment_id .. " link:" .. 
(h or "nil"))
                        else
--                          print("Skipped loc:" .. loc_id .. " bag:" .. bag_id .. " slot:" .. 
slot_id .. " msg:" .. msg_id .. " attachment:" .. attachment_id .. " link:" .. 
(h or "nil")
--                              .. " oldmsg:" .. bag.slot[slot_id].msg_id .. " oldattachment:" .. 
bag.slot[slot_id].attachment_id)
                            bag.slot[slot_id].msg_id = msg_id
                            bag.slot[slot_id].attachment_id = attachment_id
                        end

Issue 586 has been merged into this issue.

thinking about it