I can 't receive emails with attached files from Yahoo

[wamerfr]

Hi All,

I've configured a Cisco router 1841 to share internet access and redirect mail
traffic to an MS exchange server.
But I can 't receive emails with attached files from Yahoo. Google and Hotmail
work well.


This is my config:

service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!

!
boot-start-marker
boot-end-marker
!


!

!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef
!
!
!
!
!
!
!



!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
speed 100
full-duplex
!
!
interface ATM0/0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
pvc x/z
pppoe-client dial-pool-number 1
!
!
interface Dialer0
ip address negotiated
ip mtu 1492
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
ppp authentication chap callin
ppp chap hostname xxxxxxxxxxxxxx
ppp chap password 7 yyyyyyyyyyyyy

!
ip classless

ip route 0.0.0.0 0.0.0.0 Dialer0
!

ip nat inside source route-map nat-map interface Dialer0 overload


ip nat inside source static tcp 192.168.1.5 25 22.22.22.22 25 extendable
ip nat inside source static tcp 192.168.1.5 110 22.22.22.22 110 extendable

!

access-list 100 deny ip 192.168.1.0 0.0.0.255 192.168.2.0 0.0.0.255
access-list 100 permit ip host 192.168.1.58 any



route-map nat-map permit 10
match ip address 100
!



Thank you in advance.