This is done so that families who go to the office every day and return late can have their packages delivered at their leisure. On a trial basis, postmen will deliver items using a mechanized delivery technique. Following that, even speed post mail will be delivered until 8 p.m. All you have to do is register with your postcode on www.speedpost.india.gov.in. You can also use phone number as a means of identification for delivery purposes. Items below a certain size cannot be delivered by hand. The cutoff size varies from company to company - some stick to their original cutoffs, while others reduce them. Generally speaking, packages should not weigh more than 15 kg or more than 2.5 lbs. If your package does not fit into this category, then it will have to be sent through the postal system. Large parcels are sent through special carriers called "parcel agents". These agents work for various courier companies and each one covers a particular region. In fact, that's how you will usually find out which company will be best for you - by checking which regions they serve. Parcel agents are useful for large shipments or shipments going outside of India because they can provide insurance protection against loss or damage.