First of all, you need to ensure that you have the right address of the destination of the envelope. You can consult personal directory for this.
Make sure that the address you are writing on the envelope is completely correct. There should be no spelling mistake in the name of the person whom you are addressing.
If you don’t have a directory, contact the main switchboard of the place, and get the correct spellings of the complete address.
After writing the address of the receiving person, add your personal address to the envelope. It should be written on the other side of the envelope. In case the envelope does not reach the destination, it will help the post department to send it back to you.
Make sure you have written both addresses in large and clear words. Using capital letters is also very important.
It is the time to add the attention. To do this, write ‘ATTN’ or ‘ATTENTION’ right above the first line of the address you are sending the envelope to.
After writing ATTN or ATTENTION, add the name of the person in capital letters. For example, you are required to write ‘ATTN JOHN SMITH’, if you want to reach Mr John Smith.