Check for the senderEmailAddress - vba

Question

I have a listener in VBA on my outlook box to perform an action if a receive a mail from a specific email.
The problem is that if I get a error mail (non-delivery email) then my condition is run on a mail which doesn't have that property so my method crashes.
I don't know what the subject may be either.
Does anyone have an idea if I can test if the property exists or if there is another property I can check for to identify if my sender matches?
Many thanks in advance
Sub SetFlagIcon()
Dim mpfInbox As Outlook.Folder
Dim obj As Outlook.MailItem
Dim i As Integer
Set mpfInbox = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox).Folders("Test")
' Loop all items in the Inbox\Test Folder
For i = 1 To mpfInbox.Items.Count
If mpfInbox.Items(i).Class = olMail Then
Set obj = mpfInbox.Items.Item(i)
If obj.SenderEmailAddress = "someone#example.com" Then
'Set the yellow flag icon
obj.FlagIcon = olYellowFlagIcon
obj.Save
End If
End If
Next
End Sub

Answer 1

Dim obj as a generic Object - there are objects other than MailItem in your Inbox, also to improve your loop try using Items.Restrict Method (Outlook)
Option Explicit
Sub SetFlagIcon()
Dim mpfInbox As Outlook.Folder
Dim obj As Object
Dim Items As Outlook.Items
Dim i As Long
Dim Filter As String
Set mpfInbox = Application.GetNamespace("MAPI").GetDefaultFolder _
(olFolderInbox).Folders("Temp")
Filter = "[SenderEmailAddress] = 'someone#example.com'"
Set Items = mpfInbox.Items.Restrict(Filter)
' Loop all items in the Inbox\Test Folder
For i = 1 To Items.Count
If Items(i).Class = olMail Then
Set obj = Items(i)
'Set the yellow flag icon
obj.FlagIcon = olYellowFlagIcon
obj.Save
End If
Next
End Sub
Items.Restrict Method Applies a filter to the Items collection, returning a new collection containing all of the items from the original that match the filter.