The receiving line is a bit old fashioned, but it does come in rather handy from time to time. If you are getting married at a church and/or you have a lot of time to kill in between your ceremony and reception, I would highly recommend thee receiving line. This way you are able to greet all of your guests, with your parents, immediately after the ceremony, go for photos and meet them at the reception. I typically recommend this for my clients that have more than enough time in between their ceremony and reception.
Greeting Guests at the Tables
If you do not have time for a receiving line, or think it is too old fashioned, then the fall back would be to greet your guests at the tables after you have finished each course of your meal. It is always nice to have someone in charge of making sure you get back to your seats when each course is brought out so that you do not miss a course. This is a great option, but remember to keep it short and sweet at each table - keep it movong! I would also recommend that you choose to sit at a sweetheart style table so that you are not leaving your guests at your table each time you get up.
The Cocktail Hour
If you are having a less formal affair, and you are having all of your photos done before the ceremony, then it is perfectly fine to mingle at cocktail hour and visit with all of your guests. That way you can enjoy your meal without interruption and converse with those at your head table.
On The Dance Floor
If you don't like those options, and would rather keep it super casual, then just thank your guests by dancing the night away with them!!