Deferred Sender is a free service that lets you post your e-mails at any time in the future. You can send the mail from any e-mail account of any e-mail provider to any e-mail address. So, you can compose the mail after the dinner and schedule it to the morning of the next day.

Signing up is very simple. You just need to fill your e-mail ID and it will send you a mail at that ID giving you the login and password. Now, Login to the Deferred Sender and save your preferences. Select your time zone and change your password if you want.

Now in future if you want to schedule the e-mail, you just need to send the mail at deferred@deferredsender.com and in the body of the mail prefix the e-mail ID of the recipient and the time of sending the mail. The time of sending must be at least 15min after the time you send the e-mail to Deferred Sender. You will be notified after scheduling the mail. The service understands multiple date formats so you can write "today 7pm"  or "after 8hrs" or "February 13th" etc.