How to say "mailing" in Japanese

• 郵送ゆうそうJLPT N2approx.Common
  noun, suru verb, transitive verbCovers mailing in the general sense: sending items through the postal service. Use it when describing that documents or packages are being sent by mail, as in business or administrative contexts.
  計算書けいさんしょは四半期しはんきごとに郵送ゆうそうされます。↗

  Statements will be mailed every quarter.
• 投函とうかんCommon
  noun, suru verb, transitive verbRefers to the narrower act of dropping a letter into a postbox or mailbox. It focuses on depositing mail for collection rather than the whole postal process, so it is unsuitable for packages or general mailing.
  この手紙てがみを必かならず投函とうかんして下ください。↗

  Don't fail to mail this letter.

Use 郵送 for the general act of mailing something via the postal service; use 投函 for specifically dropping mail into a postbox or mailbox, the concrete act of depositing a letter.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 郵送ゆうそうmailing
• 投函とうかんmailing
• メーリングmailing