vba email embed image not showing

Question

I have an odd experience here. I have had loads of problems embedding a logo or image to emails using the src=cid... found out it wont show if not setting size for example.<

Answer 1

Just to post the simple form of code that works. Big thanks to @Eugene Astafiev.

Sub test()
    Dim oApp As Outlook.Application
    Dim oEmail As MailItem
    Dim colAttach As Outlook.Attachments
    Dim oAttach As Outlook.Attachment

    Dim olkPA As Outlook.PropertyAccessor

    Const PR_ATTACH_CONTENT_ID = "http://schemas.microsoft.com/mapi/proptag/0x3712001F"

    'create new Outlook MailItem
    Set oApp = CreateObject("Outlook.Application")
    Set oEmail = oApp.CreateItem(olMailItem)
    'add graphic as attachment to Outlook message
    'change path to graphic as needed
    Set colAttach = oEmail.Attachments
    Set oAttach = colAttach.Add("C:\temp\logo.jpg")
    Set olkPA = oAttach.PropertyAccessor

    olkPA.SetProperty PR_ATTACH_CONTENT_ID, "logo.jpg"

    oEmail.Close olSave
    'change the src property to 'cid:your picture filename'
    'it will be changed to the correct cid when its sent.
    oEmail.HTMLBody = " "

    oEmail.Save
    oEmail.To = "someemail@gmail.com"
    oEmail.Subject = "test"
    oEmail.Send

    Set oEmail = Nothing
    Set colAttach = Nothing
    Set oAttach = Nothing
    Set oApp = Nothing

End Sub