Get emails when your Bitcoin transaction gets validated and confirmed.
Transaction confirmations are needed on the Bitcoin network to prevent double-spending of the same Bitcoins.
When a user makes a transaction, this transaction is sent from the wallet to a pool of unconfirmed transactions. If the transaction is valid (meaning, is there enough coins?), it will get picked-up by miners to be included in a new block in the blockchain.
It depends of the state of the Bitcoin network, and also on the miner's fee that was used for the transaction. If you paid a high enough fee, there is more than 60% chance that your transaction will get confirmed within 10 minutes. On average, bocks are added every 10 minutes.
Very often when I make a Bitcoin transaction, I have to wait that it gets confirmed. Many services and websites that accept Bitcoin require at least three confirmations, sometimes more. It can be stressful to wait for a transaction to be verified. But I don't want to have to sit in front of my Bitcoin wallet software for too long, waiting for the confirmations to come. Whith this service, I get an email alert once my transaction is confirmed.
Each confirmation decreases the risk of a transaction to be reversed. It is generally accepted for most transactions that 6 confirmations represent enough security to assure the transition is valid.