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Digging up this corpse. I thought it wasn't re-routing back out to the internet because I had an internal 'valid' address in a recipient map. Took that out and now it's rejecting due to an unknown user. Could really use some help here. Thanks!

We recently began accepting mail for another business. One of the addresses needs to be forwarded to an external address. I need to remap user1@domainC to user2@domainD. I'm not using virtual domains currently and I am concerned by adding them I'll miss something and require a fire extinguisher...

Cisco suggested switching the default gateway to use DHCP instead of the interface, and that fixed the issue. Using an interface as a default gateway needs the outside device to proxy arp, which is not always true. Removing "ip nat inside" and/or "ip nat outside" from the config broke the...

I'm connecting a 871 router to an ISP device and need help routing traffic. It works perfectly when I can use a public IP address on the WAN interface of the 871 (whether provided by a DHCP lease or statically). But if the ISP router is using a private address range in it's DHCP scope then I...

We have about 150 remote offices connected with various ISP's, typically DSL, cable, or a T1. They all have Cisco routers and we use IPSec to tunnel back to our corporate office. The locations currently all use static IP addresses and we're considering re-subnetting all locations for future...

We've recently noticed a few users who's internal mail is hitting our external mailserver when it should not. For whatever reason, their domain in their e-mail address is getting duplicated and the servers think it is an external address. For instance: - UserA@domain.com sends e-mail to...