a1 authenticator:
client_condition = 
client_set_id = 
driver = plaintext
public_name = PLAIN
server_advertise_condition = 
server_condition = xxx
server_debug_print = 
server_mail_auth_condition = 
server_set_id = 
no_client_ignore_invalid_base64
client_send = 
server_prompts = 

a2 authenticator:
client_condition = 
client_set_id = 
driver = plaintext
public_name = PLAIN
server_advertise_condition = 
server_condition = 
server_debug_print = 
server_mail_auth_condition = 
server_set_id = 
no_client_ignore_invalid_base64
client_send = 
server_prompts = 

a3 authenticator:
client_condition = 
client_set_id = 
driver = plaintext
public_name = LOGIN
server_advertise_condition = 
server_condition = 
server_debug_print = 
server_mail_auth_condition = 
server_set_id = 
no_client_ignore_invalid_base64
client_send = 
server_prompts = 

a4 authenticator:
client_condition = 
client_set_id = 
driver = plaintext
public_name = LOGIN
server_advertise_condition = 
server_condition = 
server_debug_print = 
server_mail_auth_condition = 
server_set_id = 
no_client_ignore_invalid_base64
client_send = 
server_prompts =