FYI...
I received an offer through snail mail for a signup bonus of 60000 miles after spending $1000 in the first three months and also getting a $50 credit on the first Delta purchase in the first three months.
I had applied for that card a month ago with another offer for 50000 miles signup bonus after the same spend; I was targeted via email. I called customer service yesterday for a match and I was told that they will do that, and they opened a case for it.