Keyboard Mnemonics begin with the escape character @. For Example @E sends the Enter_key to the Emulator.
To send the @ character use @@
For example: EMSendKey  "yourmail@@gmail.com"

That worked just fine, however I'm now running into another issue.  I cannot find a Replace type of command.  I want to take the variable value, say strEmail and do something like Replace(strEmail, "@", "@@") to replace all of the @ in the string strEmail with @@ instead.  There must be a command that could help me out with this, but I do not see one.

Not sure what you are trying to accomplish with your script.
But RUMBA has built in features that detects Email Addresses in your Emulation screen and turns them into hyperlinks. This feature works with:

• HTTP and HTTPS Addresses

• Email Addresses

• File Addresses

The feature is available under Options -> Rumba Options

If you still want to have a replace function in your script you will need to write your own replace()- function.

This is how I would solve it

Sub Main
   Dim strEmail As String
   strEmail= your.email@gmail.com
   ReplaceChrs(strEmail)

End Sub

Function ReplaceChrs(s As String) As String

Static RegEx As Object
If RegEx Is Nothing Then
Set RegEx = CreateObject("VBScript.RegExp")
   With RegEx
   RegEx.Global = True
      RegEx.Pattern = "@"
   End With

End If

RemChrs = RegEx.Replace(s, "@@")
MsgBox RemChrs

End Function

Nevermind, I just used my own:

varAtSymbol = InStr(varDataEmail, "@")

varDataEmail = Left(varDataEmail, varAtSymbol ) "@" Right(varDataEmail, Len(varDataEmail) - varAtSymbol)