退信
- 退信提示:"unavailable mail user"
- 退信提示:"Mailbox not found"
- 退信提示:"invalid user"
- 退信提示:"restricted"
- 退信提示:"user disabled"
- 退信提示:"user not known"
- 退信提示:"local server don't exists that user"
- 退信提示:"mailbox currently unavailable"
- 退信提示:"Bad recipient address syntax"
- 退信提示:"The email account that you tried to reach"
- 退信提示:"recipient does not have an account"
- 退信提示:"This account has been temporarily suspended"
- 退信提示:"This user doesn't have a yahoo.com account"
- 退信提示:"not user of this server"
- 退信提示:"Bad address syntax"