Why can't DMZ hosts access Internet. Email is flowing fine into DMZ

[karlvg]

PIX Version 6.3(3)
interface ethernet0 auto
interface ethernet1 auto
interface ethernet2 auto
interface ethernet3 100basetx
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 dmz security50
nameif ethernet3 pcgother security40
enable password encrypted
passwd encrypted
hostname fwpcg
domain-name pacificcap.com
clock timezone PST -8
clock summer-time PDT recurring
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list outside_access_in permit tcp any host x.x.x.x eq smtp
access-list dmz_access_in permit tcp 192.168.10.0 255.255.255.0 any
access-list dmz_access_in permit tcp host 192.168.10.12 host 192.168.20.5 eq smtp
pager lines 24
logging on
logging timestamp
logging trap critical
logging host inside
mtu outside 1500
mtu inside 1500
mtu dmz 1500
mtu pcgother 1500
ip address outside x.x.x.x
ip address inside 192.168.20.1 255.255.255.0
ip address dmz 192.168.10.1 255.255.255.0
ip address pcgother 192.168.2.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
no failover
failover timeout 0:00:00
failover poll 15
arp timeout 14400
global (outside) 10 x.x.x.x
global (dmz) 10 192.168.10.15
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 10 0.0.0.0 0.0.0.0 0 0
nat (dmz) 10 0.0.0.0 0.0.0.0 0 0
nat (pcgother) 10 0.0.0.0 0.0.0.0 0 0
static (inside,dmz) 192.168.20.5 192.168.20.5 netmask 255.255.255.255 0 0
static (dmz,outside) 64.80.146.212 192.168.10.12 netmask 255.255.255.255 0 0
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 64.80.146.209 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
telnet 192.168.20.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
console timeout 0

 

[bwilliam13]

You don't need this line:

global (dmz) 10 192.168.10.15

Also, the following line...

nat (dmz) 10 0.0.0.0 0.0.0.0 0 0

...should be...

nat (dmz) 10 192.168.10.0 255.255.255.0 0 0

Also, add...

access-list dmz_access_in permit udp 192.168.10.0 255.255.255.0 any

Without that line, you won't be able to resolve internet names. DNS uses UDP, not TCP.