Coba cek port POP3 dan IMAP apa sudah terbuka, klo mo akses via browser port 143 harus terbuka, coba pake perintah ini
# netstat -tapn
atau
#nmap localhost
beberapa port yang perlu dibuka :
port 110 ---> pop3
port 143 ---> imap
port 25 ---> smtp
klo sudah open coba tes melalui telnet
# telnet localhost 143
klo keluar kayak dibawah ini berarti sudah bisa
Trying 192.168.12.10...
Connected to 192.168.12.10.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE STARTTLS] Courier-IMAP ready. Copyright 1998-2003 Double Precision, Inc. See COPYING for distribution information.
a login postmaster@mydomain.com my_password
a OK LOGIN Ok. (successful login!)
a logout (logs you out)
* BYE Courier-IMAP server shutting down
a OK LOGOUT completed
Connection closed by foreign host.
lalu coba deh hordenya..