mail transfer造句

1、A mail transfer agent such as Sendmail 8.7 or later.
一个邮件传输代理，比如Sendmail 8.7或者更高的版本。

2、E-mail is sent via mail transfer agents, mail delivery agents, and mail user agents.
电子邮件通过邮件传输代理、邮件发送代理及邮件用户代理发送。

3、I will explain for you. The other two are mail transfer and demand draft.
我来跟您解释，其余两种是信汇和票汇。