I have a client with an ASA 5510. He has a range of public IP numbers and previously had his Exchange configured for one of them (155). The ASA 5510 has a static IP on the outside interface (153). He had some issues with emails being rejected due to the reverse lookup not matching, so he changed his MX record to point to 153. We can bind port 25 on the outside interface, but we cannot bind port 443 - it gives an error that the port is already bound. But I cannot locate where it is bound. There is no ASDM access configured for the outside.
We are hoping to resolve this issue as soon as possible. Thanks in advance for your help.