librfc2822 provides application developers with a complete parser for RFC2822 addresses. Not only can you use the library to verify that RFC2822 addresses are syntactically correct, you can also have an address split up into its semantic parts, what is needed when deciding where to route an address to, etc. What is quite unique is that librfc2822 does indeed parse all address types allowed by the standard. That includes such weird things as "address groups" or addresses with whitespace and comments throw in.
