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Cisco ASA5505 NAT internal access to local mail server?

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Cisco ASA5505 NAT internal access to local mail server?

tokyogwb
I have setup an ASA 5505 firewall with DMZ which hosts a mail server.
From outside there is full access to the mail server and it is recieving emails.
However, I am not able to access this server from inside although I have full access to internet and other outside resources.

Here is the config.
ASA Version 8.0(4)
!
hostname ciscoasa
domain-name domain-name.com
enable password dqNVmGv0M1aiohVM encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0
ospf cost 10
!
interface Vlan2
nameif outside
security-level 0
ip address xxx.xxx.xxx.250 255.255.255.248
ospf cost 10
!
interface Vlan5
nameif dmz
security-level 50
ip address 192.168.123.1 255.255.255.0
ospf cost 10
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
switchport access vlan 5
!
interface Ethernet0/7
switchport access vlan 5
!
ftp mode passive
clock timezone JST 9
access-list Mail extended permit tcp any 192.168.123.0 255.255.255.0 eq pop3
access-list Mail extended permit tcp any 192.168.123.0 255.255.255.0 eq smtp
access-list Mail extended permit tcp any 192.168.123.0 255.255.255.0 eq 32000
access-list Mail extended permit tcp any 192.168.123.0 255.255.255.0 eq 587
access-list RemoteDT extended permit tcp any 192.168.123.0 255.255.255.0 object-group RemoteDT
access-list RemoteDT extended permit tcp any xxx.xxx.xxx.248 255.255.255.248 object-group RemoteDT
access-list Radmin extended permit tcp any 192.168.123.0 255.255.255.0 object-group Radmin
access-list Radmin extended permit tcp any 192.168.1.0 255.255.255.0 object-group Radmin
access-list dmz_access_in extended permit ip xxx.xxx.xxx.248 255.255.255.248 any

access-list dmz_access_in extended permit ip 192.168.1.0 255.255.255.0 any
access-list dmz_access_in extended permit ip any any
access-list inside_access_in extended permit ip any xxx.xxx.xxx.248 255.255.255.248
access-list inside_access_in extended permit ip any 192.168.123.0 255.255.255.0

access-list outside_access_in extended permit ip any host xxx.xxx.xxx.251
access-list outside_access_in extended permit ip any host xxx.xxx.xxx.252
access-list outside_access_in extended permit ip any host xxx.xxx.xxx.253
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu dmz 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-613.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (dmz,outside) xxx.xxx.xxx.252 192.168.123.3 netmask 255.255.255.255
static (dmz,outside) xxx.xxx.xxx.253 192.168.123.4 netmask 255.255.255.255
static (inside,outside) xxx.xxx.xxx.251 192.168.1.2 netmask 255.255.255.255
access-group inside_access_in in interface inside
access-group outside_access_in in interface outside
access-group dmz_access_in in interface dmz
route outside 0.0.0.0 0.0.0.0 xxx.xxx.xxx.249 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.50-192.168.1.150 inside
dhcpd dns 192.168.1.2 211.129.14.139 interface inside
dhcpd lease 40000 interface inside
dhcpd enable inside
!

threat-detection basic-threat
threat-detection statistics host
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:e0c4edf41a0d239705fd7a8d30e3e3b7
: end
ciscoasa#

Can anyone help me with this?