user78: There was at least one site that did this I remember.

user26481: Try http://blockonomics.co  . I use it get email notifications and check balance, sends a nice formatted email

user54916: https://cryptocurrencyalerting.com might be what you're looking for.  They will monitor a BTC or ETH wallet address and notify you whenever a transaction occurs. 
 Supports email/sms/telegram/slack/etc.  ERC-20 coins are accepted.
(Disclosure: I am affiliated with the creators of this service)

user13616: As of October 2015, the only services that still seem to offer email notifications (for free) for transactions on an address (for which they don't need the private key) appear to be:

http://blockchain.info/wallet with the option to add a wallet as watch-only. It doesn't seem 100% reliable (it missed a few transactions initially), but now it seems to work and gives a notification pretty much instantly.
http://blockonomics.co with which I had a temporary problem with validating the confirmation email, but seems to work otherwise. Notification emails arrive a bit later (maybe they wait for the transaction to be confirmed or something like that?).


user3133: http://bitping.net will send you email notifications on any transactions to/from a bitcoin address.

user45871: http://bitcoinwhoswho.com/
you can set up free transaction alerts for any bitcoin address here

user153: 
http://www.Blockchain.info/wallet <-- add address as watch-only.
http://bitnotify.com
http://bitcoinwhoswho.com
http://txnotify.com


78: <p>There was at least one site that did this I remember.</p>
 26481: <p>Try <a href="http://blockonomics.co" rel="nofollow">http://blockonomics.co</a>  . I use it get email notifications and check balance, sends a nice formatted email</p>
 54916: <p><a href="https://cryptocurrencyalerting.com" rel="nofollow noreferrer">https://cryptocurrencyalerting.com</a> might be what you're looking for.  They will monitor a BTC or ETH wallet address and notify you whenever a transaction occurs. 
 Supports email/sms/telegram/slack/etc.  ERC-20 coins are accepted.
(Disclosure: I am affiliated with the creators of this service)</p>
 13616: <p>As of October 2015, the only services that still seem to offer email notifications (for free) for transactions on an address (for which they don't need the private key) appear to be:</p>

<ul>
<li><p><a href="http://blockchain.info/wallet" rel="nofollow">http://blockchain.info/wallet</a> with the option to add a wallet as watch-only. It doesn't seem 100% reliable (it missed a few transactions initially), but now it seems to work and gives a notification pretty much instantly.</p></li>
<li><p><a href="http://blockonomics.co" rel="nofollow">http://blockonomics.co</a> with which I had a temporary problem with validating the confirmation email, but seems to work otherwise. Notification emails arrive a bit later (maybe they wait for the transaction to be confirmed or something like that?).</p></li>
</ul>
 3133: <p><a href="http://bitping.net" rel="nofollow">http://bitping.net</a> will send you email notifications on any transactions to/from a bitcoin address.</p>
 45871: <p><a href="http://bitcoinwhoswho.com/" rel="nofollow noreferrer">http://bitcoinwhoswho.com/</a></p>

<p>you can set up free transaction alerts for any bitcoin address here</p>
 153: <ul>
<li><a href="http://www.Blockchain.info/wallet" rel="nofollow noreferrer">http://www.Blockchain.info/wallet</a> &lt;-- add address as watch-only.</li>
<li><a href="http://bitnotify.com" rel="nofollow noreferrer">http://bitnotify.com</a></li>
<li><a href="http://bitcoinwhoswho.com" rel="nofollow noreferrer">http://bitcoinwhoswho.com</a></li>
<li><a href="http://txnotify.com" rel="nofollow noreferrer">http://txnotify.com</a></li>
</ul>
