snail mail
noun /ˈsneɪl meɪl/
/ˈsneɪl meɪl/
[uncountable] (informal, humorous)- used to describe the system of sending letters by ordinary mail, contrasted with the speed of sending email
慢速邮递(电邮使用者用以指普通邮寄) Collocations DictionarySnail mail is used before these nouns:- address