sieve is working with allowplaintext: yes

[JOYDEEP]

OK list,

finally I have solved it.

in /etc/imapd.cong   I have modified

allowplaintext: yes
sasl_minimum_layer: 0
sasl_mech_list: LOGIN  PLAIN


and now sieve is working well. but I like to know how  [allowplaintext:
yes] can effect my security than
[allowplaintext: no]  ?

thanks