Offer your thoughts or opinion on the input financial query or topic using your financial background.

Physical Checks - Mailing
Lets say you owed me $123.00 an wanted to mail me a check. I would then take the check from my mailbox an either take it to my bank, or scan it and deposit it via their electronic interface. Prior to you mailing it you would have no idea which bank I would use, or what my account number is. In fact I could have multiple bank accounts, so I could decide which one to deposit it into depending on what I wanted to do with the money, or which bank paid the most interest, or by coin flip. Now once the check is deposited my bank would then "stamp" the check with their name, their routing number, the date, an my account number. Eventually an image of the canceled check would then end up back at your bank. Which they would either send to you, or make available to you via their banking website. You don't mail it to my bank. You mail it to my home, or my business, or wherever I tell you to mail it. Some business give you the address of another location, where either a 3rd party processes all their checks, or a central location  where all the money for multiple branches are processed. If you do owe a company they will generally ask that in the memo section in the lower left corner that you include your customer number. This is to make sure that if they have multiple Juans the money is accounted correctly. In all my dealings will paying bills and mailing checks I have never been asked to send a check directly to the bank. If they want you to do exactly as you describe, they should provide you with a form or other instructions.