It's an long held tradition that it's good manners for the bride and groom to greet and thank every guest at the wedding. Either with a receiving line or by making their rounds at the tables during dinner.
For my wedding, my fiancé and I will get our food first and proceed to make our rounds to all the tables and greet everyone personally. This was actually the one request my mother was very adamant about us doing at our wedding, because it's considered good manners. I agree that it's good manners, so we would have planned to do it anyway even if she hadn't mentioned it.
How do you feel about this tradition? Do you think it's necessary? Is it ungrateful or rude for the couple not to make an effort to briefly speak with each guest? Or do you think it's outdated and a thank you card after the fact is enough acknowledgement?