ASA port mapping problem

I am replacing my old PIX firewall with the newer ASA 5520 firewall. I am using the ASA default settings and I copied the config from the PIX to the ASA. I have two mail servers sitting behind the firewall, one is accessible (xx.xx.xx.20) from the internet but the other (xx.xx.xx.19) is not. When I change back to the PIX with the same config all the servers are accessible. What is the problem with the ASA???

This is my config on the ASA.
:
ASA Version 7.2(2)
!
hostname WVFIREWALL
enable password 5O.2aOZ7l3VT32Un encrypted
names
!
interface GigabitEthernet0/0
 nameif inside
 security-level 100
 ip address 10.0.2.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif outside
 security-level 0
 ip address XX.XX.XX.18 255.255.255.252
!
interface GigabitEthernet0/2
 shutdown
 nameif DMZ
 security-level 100
 ip address 10.0.3.1 255.255.255.252
!
interface GigabitEthernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.1.1 255.255.255.0
 management-only
!
passwd FjoZTiA4T3LcfG6U encrypted
ftp mode passive
access-list inbound extended permit icmp any any echo-reply
access-list inbound extended permit icmp any any time-exceeded
access-list inbound extended permit icmp any any unreachable
access-list inbound extended permit tcp any host XX.XX.XX.19 eq lotusnotes
access-list inbound extended permit tcp any host XX.XX.XX.20 eq lotusnotes
access-list inbound extended deny ip any any
pager lines 24
logging enable
logging buffered informational
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu DMZ 1500
mtu management 1500
ip verify reverse-path interface outside
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-522.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) XX.XX.XX.20 10.0.2.6 netmask 255.255.255.255
static (inside,outside) XX.XX.XX.19 10.0.2.4 netmask 255.255.255.255
access-group inbound in interface outside
route outside 0.0.0.0 0.0.0.0 XX.XX.XX.17 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 uauth 0:05:00 absolute
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet 10.0.2.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 5
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
!
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:478cb3389a328cb12ed3cad024397506
: end
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