If you do it by SSH or telnet, do a show run, go all the way to the bottom, you will see this:
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
in config mode type: (assuming you know how to get there)
policy-map global_policy (press enter)
then type
class inspection_default (press enter)
now type
no inspect esmtp (press enter)
type
write (press enter)
now the esmtp inspect is disabled
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by: MikeKanePosted on 2009-05-26 at 11:22:49ID: 24475982
You can use either the GUI or the command line....
If you have access to ASDM GUI then:
Configuration --> Service Policy Rules --> General/Global Policy --> Edit ---> Rule Actions --> Uncheck ESMTP
Click OK --> Apply --> Save
Or for the command line:
Use telnet, ssh, or via a direct console connection.... All depends on how it was setup. Once you are connected:
enable
(enter the enable password)
config t
no fixup protocol smtp 25
exit
write mem
You can safely remove the fixup while users are connected....