noun
Refers to the act of sending something off, such as a letter, package, or messenger.
書類の差し立てを急いでください。
Please hurry the dispatch of the documents.
差し立ての準備が整いました。
The preparations for sending are complete.
発送 is more common for sending goods or mail, while 差し立て can imply a more formal or deliberate dispatch.
差し出す is the verb 'to send' or 'to present'; 差し立て is the noun form of the act.
Compound of 差し (prefix form of 差す, 'to point' or 'to send') and 立て (noun form of 立てる, 'to set up' or 'to dispatch').