[Dovecot] nul byte in pop protocol

[Nick Zhokhov]

Hi
dovecot 0.99 (from fc4)
/etc/dovecot.conf
client_workarounds = outlook-pop3-no-nuls

request
USER <Username> 
response
+OK \r \n \0x00

It seems that after getting zero byte OE 6.00.2600.2100
doesn't want to send password
request
PASS \r \n

and of course authentication fails.

What is a reason to send zero byte in pop protocol at all?

--Nick Zhokhov