Redmine

Hello all,

I am facing a problem about redmine. On my server redmine have more two project. But only a project can not receive email notification, other project it work normally. i have check some case:

- configuration of file configuration.yml is correctly
- in log file production.log have error :"Email delivery error: 501 5.1.3 Invalid address". But I have checked all email of member in project are valid all.

This is my redmine version:

Environment:
Redmine version                3.0.3.stable
Ruby version                   2.0.0-p645 (2015-04-13) [i386-mingw32]
Rails version                  4.2.1
Environment                    production
Database adapter               Mysql2
SCM:
Subversion                     1.8.11
Git                            1.9.4
Filesystem                     
Redmine plugins:
no plugin installed

Is there someone can help me fixed this problem.

Thanks and Regards,
HuyDB