退信 meaning in Chinese

convicted
ndr

4sorry , i couldn ' t find any host named duroglos . com . my
答：退信原因：发送地址被拒绝。
5user mailbox exceeds allowed size : wangyang @ mail . chemall . com
答:退信原因：邮箱用户超过容量，请及时收取邮件。
Dropping it in the return letter box set up by your building management , if any
把邮件投进大厦管理处的退信收集箱(如有的话) 。
I send it to the forum because i can write back for the problem of ? the mail system . i hope you can see
因邮件无法回复,系统总是退信,找不到原因,只好发到论坛上来,希望你能看到