Be aware: This addon is currently causing the mailbox to not show up when you have existing mail.  Honestly there is no reason to even have this addon, it doesn't work when you click on it anyway. 

This addon is totally useless now as is explained below. In Legion they basically took away the cross realm hopping trick for getting rares.

https://www.curseforge.com/wow/addons/lookingforgroup-cross-realm-enhancement  :

With patch 7.0.3 Blizzard changed the way you transfer from realm to realm when joining a cross realm group. In patches 6.2.4 or prior, there was a global group transfer, where you would change your realm depending on the current realm of the party. If a group was on Sunstrider realm and you joined that group, you would be transferred to the Sunstrider if you’re not in combat.

As Garrosh said to Gul’dan: “Times change.” With Legion release there’s a new rule: You can transfer to a new realm only if there's another player from your party in the same zone as you. The first person from the party, who enters the zone, will mark that zone for its player’s realm.

What that means:

• Zones are now independent and you change realms in there depending on its current flag. Flag is put once a player is in a group and enters a zone. Flag is being removed when all players leave that zone.
• You’ll be transferred if you’re in a zone, and you join a party with a player already in that zone.
• You’ll be transferred if you enter the zone’s by crossing its border and there’s already a player from your group in that zone.
• You’ll NOT be transferred if you enter zone if no other player from your party is there.
• Even if you’re not a leader, if you were the only person from the group in the zone and another player from that group comes to that zone, he will be transferred to your realm, since you’re the first person, who entered that zone while in a group.

In reply to Retloldin:

Date: 2018-06-08 16:19:28
ID: 1
Error occured in: Global
Count: 1
Message: ...AddOns\CrossRealmAssist\CrossRealmAssistSettings.lua line 39:
Cannot find a library instance of "AceConfig-3.0".
Debug:
[C]: error()
!Swatter\Support\LibStub.lua:23: LibStub()
...AddOns\CrossRealmAssist\CrossRealmAssistSettings.lua:39: in main chunk
Locals:
(*temporary) = "Cannot find a library instance of "AceConfig-3.0"."

AddOns:
Swatter, v7.6.5736 (TasmanianThylacine)
AucAdvanced, v7.6.5736 (TasmanianThylacine)
AucFilterBasic, v7.6.5736 (TasmanianThylacine)
AucFilterOutlier, v7.6.5736.5459(/embedded)
AucMatchUndercut, v7.6.5736.5585(/embedded)
AucStatHistogram, v7.6.5736 (TasmanianThylacine)
AucStatiLevel, v7.6.5736 (TasmanianThylacine)
AucStatPurchased, v7.6.5736 (TasmanianThylacine)
AucStatSales, v7.6.5736.5598(/embedded)
AucStatSimple, v7.6.5736 (TasmanianThylacine)
AucStatStdDev, v7.6.5736 (TasmanianThylacine)
AucStatWOWEcon, v7.6.5736.5613(/embedded)
AucUtilAHWindowControl, v7.6.5736.5575(/embedded)
AucUtilAppraiser, v7.6.5736.5727(/embedded)
AucUtilAskPrice, v7.6.5736.5599(/embedded)
AucUtilAutoMagic, v7.6.5736.5732(/embedded)
AucUtilCompactUI, v7.6.5736.5715(/embedded)
AucUtilEasyBuyout, v7.6.5736.5725(/embedded)
AucUtilFixAH, v7.6.5736 (TasmanianThylacine)
AucUtilItemSuggest, v7.6.5736.5651(/embedded)
AucUtilPriceLevel, v7.6.5736.5633(/embedded)
AucUtilScanButton, v7.6.5736.5631(/embedded)
AucUtilScanFinish, v7.6.5736.5725(/embedded)
AucUtilScanProgress, v7.6.5736.4979(/embedded)
AucUtilScanStart, v7.6.5736.5725(/embedded)
AucUtilSearchUI, v7.6.5736.5731(/embedded)
AucUtilSimpleAuction, v7.6.5736.5705(/embedded)
AucUtilVendMarkup, v7.6.5736.4828(/embedded)
Babylonian, v5.1.DEV.332(/embedded)
BeanCounter, v7.6.5736 (TasmanianThylacine)
Configator, v5.1.DEV.434(/embedded)
CrossRealmAssist, v0.81 beta
DebugLib, v5.1.DEV.337(/embedded)
LibExtraTip, v5.12.DEV.435(/embedded)
SlideBar, v7.6.5736 (TasmanianThylacine)
Stubby, v7.6.5736 (TasmanianThylacine)
TipHelper, v5.12.DEV.405(/embedded)
BlizRuntimeLib_enUS v7.3.5.70300 <none>
(ck=6ad)

Any chance for n'update?  i loved this addon...

Ive changed the Lua. file with the recommended changes but I am having no luck changing realms in eastern kingdoms (old zones) I know  blizz made a change about this but I was wondering will this still change my realm in old zones or is that totally impossible now or does the party leader have to be in that zone? is there a way of telling where the leader is before i join a zone?

Basically im trying to kill rares in the old zones to level up.

Also if im in a Party of 2 is there a quick way of hopping both people at the same time?

You do still have to update three lines of code to make this add-on work. The post from Pompachomp gives the code changes and the post from Thejasper01 gives some info on how.

dont work.. scan for hours ??!?!?!

SOOOOOOOO

Yes or No???

Updated August 1st!!!  Still need to modify the addon?

For those confused on how to modify this still, go into your Wow folder, then add ons, then click cross realm assist. Click on the bigger file for  CrossRealmAssist.lua. When it prompts you on how to open, just click to open with Notepad. Then click Edit and find. Insert the line of what you want to replace and hit search. It will bring you to the location of the text. Then just copy the new, select the old and replace. Then move on. After all the text has been found and replaced just hit save from the file drop list. All done! It will work if u did it right.  Scroll down for all the new mod info in the other post. Goodluck!

This worked for me using pompachomp info from post on June 21, 2017. Thanks

Useless , need update.

The fix appears to be the following:

Old:

    Line 657:     lfgui.title:SetText("Click to join group");
    Line 659:     dragRect:SetAllPoints(lfgui.title)
New:
    Line 657:     lfgui.Title:SetText("Click to join group");
    Line 659:     dragRect:SetAllPoints(lfgui.Title)

line 750:

C_LFGList.Search(addon.lfgGroups[curLfgGroup],"",nil,nil,languages)
to

C_LFGList.Search(addon.lfgGroups[curLfgGroup],LFGListSearchPanel_ParseSearchTerms(""),nil,nil,languages)

Thanks. This worked for me.