Well, after more digging around in the source code, I managed to work out a fix, based on a suggestion in this post.

However I have written explicit instructions below in the hope that the next...

Thanks very much post #3. Meanwhile I had managed to check out the source and the problem is indeed caused by a wrong config value for zimbraLmtpBindAddress. However WHICH FILE are you referring...

Well, since no one is replying, I am trying to check out the 5.0.13 source to find the problem. However since I am not familiar with Perforce it is a RIGHT PAIN trying to get at the source. I have...

I have two Zimbra servers which have to deal with a new subnet, due to internal network restructuring.

Old subnet: 192.168.0/24
New subnet: 10.10.10.0/24

Server 1 is Production Server, runs...