Hello, with the new patch and CATA Classic this addon is not loading anymore. I am not getting any errors all of the addon icons are around the minimap once more.

Can you try disabling all other addons that fiddle with the minimap?
I am online in Cataclysm Classic and it collects the Questie button just fine.

It is working now,

I am getting this error which I am not sure if it's a postal error or a Minimap Button Error?

Date: 2024-05-02 15:04:20
ID: 10
Error occured in: Global
Count: 1
Message: Interface/AddOns/Postal/Postal.lua line 221:
attempt to index global 'MiniMapMailFrameMixin' (a nil value)
Debug:
[string "=[C]"]: ?
[string "@Interface/AddOns/Postal/Postal.lua"]:221: MAIL_CLOSED()
[string "@Interface/AddOns/Postal/Postal.lua"]:110: ?()
[string "@Interface/AddOns/DataStore/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:109:
...ore/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:109
[string "=[C]"]: ?
[string "@Interface/AddOns/DataStore/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:19:
...ore/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:15
[string "@Interface/AddOns/DataStore/libs/CallbackHandler-1.0/CallbackHandler-1.0.lua"]:54: Fire()
[string "@Interface/AddOns/DataStore/libs/AceEvent-3.0/AceEvent-3.0.lua"]:120:
.../AddOns/DataStore/libs/AceEvent-3.0/AceEvent-3.0.lua:119
[string "=[C]"]: CloseMail()
[string "*MailFrame.xml:847_OnHide"]:1:
[string "*MailFrame.xml:847_OnHide"]:1
[string "=[C]"]: Hide()
[string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:590: SetUIPanel()
[string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:670: HideUIPanel()
[string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:323:
...PanelManager/Classic/UIParentPanelManager_Shared.lua:315
[string "=[C]"]: SetAttribute()
[string "@Interface/AddOns/Blizzard_UIParentPanelManager/Classic/UIParentPanelManager_Shared.lua"]:1115: HideUIPanel()
[string "@Interface/AddOns/Blizzard_SharedXML/Classic/SharedUIPanelTemplates.lua"]:193:
...lizzard_SharedXML/Classic/SharedUIPanelTemplates.lua:184
Locals:
(*temporary) = defined =[C]:-1

This is an error in Postal as can be seen in the first "Message" line where it says

Message: Interface/AddOns/Postal/Postal.lua line 221:

There is a comment with a fix on the Postal curseforge site too: https://www.curseforge.com/wow/addons/postal/comments

So I'll go ahead and close this issue.