1.2 Four connection modes of SMS
Email worker plays an important role on SMS operations on bring in new users (see 1.3 How to bring in users?) and login to the messaging site (see 1.4 How to login?). However, email may be blocked in your local area, or using email to bring in new users or login to the messaging site may not suit for you. Therefore, SMS lets you choose whether to use email on recruiting new users and login operations, so it has four different connection modes, and their meaning are shown below:

Mode 0:  Use email on both recruiting new users and login operations.
Mode 1:  Don't use email on both recruiting new users and login operations.
Mode 2:  Use email on recruiting new users operation but not on login process.
Mode 3:  Don't use Email on recruiting new users operation but use email on login process.

They are summarized in table 1.2.1:
Mode Use Email on Recuiting New User Process Use Email on Login Process
0 Yes Yes
1 No No
2 Yes No
3 No Yes
Table 1.2.1
 
Notes:
1. If you can't use email for your SMS operations, select connection mode 1 to overcome this situation.
2. Connection mode is selected on SMS installation, and can be changed later by amending misc. system setting 'connection_mode'. Please refer to section 4.6.5 misc. system settings for details.