I am assuming when you say "All users accessing the email server are required to login" you meant AAA authentication by the firewall. If so you need to modify your access list to match the traffic destination as mail server. Can you post your AAA and accesslist config ?
No, there is no AAA authentication in FWSM to authenticate such services. Its actually referred to the SMTP server where normally, without firewall protection, it can be accessed easily and execute commands that can be used to relay email for whatever purposes. With Cisco PIX/FWSM, it only allows few SMTP commands to be executed for security protection. This is shown under fixup protocol smtp 25.
The Server Vlan is controlled by the other team, and nothing has been changed on their mail server before,during or after the server vlan migrated behind fwsm.
FWSM (transparent mode) maintain the standard fixup protocol for smtp.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...