[Jonathan.Wood]

I have done all the troubleshooting I can think of. My ISP and my domain MX records have been confirmed to be correct. The last problem I can think of, is that my PIX is blocking the traffic. Can you verify my config is correct please?

PIX Version 8.0(4)32
!
hostname pixfirewall
domain-name home.jkkcc.com
enable password DQucN59Njn0OjpJL encrypted
passwd DQucN59Njn0OjpJL encrypted
names
name 192.168.2.22 exchange
!
interface Ethernet0
nameif outside
security-level 0
ip address xxx.xxx.118.208 255.255.255.224
!
interface Ethernet1
nameif inside
security-level 100
ip address 10.0.20.1 255.255.255.248
!
interface Ethernet2
shutdown
nameif exchange
security-level 100
ip address 10.0.30.1 255.255.255.248
!
ftp mode passive
dns domain-lookup inside
dns server-group DefaultDNS
name-server 68.105.28.16
name-server 68.105.29.16
domain-name home.jkkcc.com
access-list smtp_in extended permit tcp any host xxx.xxx.118.208 eq smtp
pager lines 24
mtu outside 1500
mtu inside 1500
mtu exchange 1500
icmp unreachable rate-limit 1 burst-size 1
icmp deny any outside
asdm image flash:/asdm-61551.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) tcp interface smtp exchange smtp netmask 255.255.255.255
!
router eigrp 1
network 10.0.0.0 255.0.0.0
network 192.168.0.0 255.255.255.0
network 192.168.2.0 255.255.255.0
network 192.168.4.0 255.255.255.0
!
route outside 0.0.0.0 0.0.0.0 24.234.118.193 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
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
http server enable
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community *****
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet 0.0.0.0 0.0.0.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
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 netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
inspect http
inspect ils
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:0a435a79db9212e8f8c23a3b60f77a23
: end

Here is my network layout

Cable modem --->Pix ------> Cisco 3745 -----> Switch ------>Exhcnage Server