No, just send it by regular mail.

不需要，用平信寄就可以了。

youdao

How did regular mail get delivered?

那普通的信件怎么寄呀？

youdao

Steven: I'd like to send it by regular mail.

史蒂文：我想寄个普通邮件。

youdao

The last regular mail delivery was on September 19th, and thereafter they used balloons.

最后一封常规邮件于九月十九日发出,在那之后他们只能用热气球传送消息

耶鲁公开课 - 1871年后的法国课程节选

He gives the example of e-mail: in a way, it is much the same as regular mail but faster.

ECONOMIST: Eventually, bigger means different

Ensure the organization and implementation of various means of communication used by the Organization: regular mail, airmail, diplomatic pouch, courier services, etc.

UNESCO: Vacancy : Chief of Unit (28/2/2011) (ADM 552 - (P1P2))

The Winner will be notified by telephone, regular mail or e-mail and must meet all eligibility requirements including the execution and delivery of all necessary releases.

CNN: Inside the Envelope