Email delivery delayed 4 months?

On August 7th I used my father-in-laws laptop computer, out of town, on a wireless hookup in a resort. I logged on to my bank to make an account transfer and on to my auto insurance company to make a payment. I emailed the transaction and confirmation numbers to my email address. On December 3rd the emails finally showed up in my box. Four months later! They were marked sent December 3rd, although I had sent them August 7th and never received them till now. Anybody have an idea what is happening here? He uses Comcast and I use Verizon/MSN.