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1

As far as I can see you just want to send mails. In this case you must not set an MX record for the server, as your mail server is not responsible for any domain. If I understand your problem, you really just want an MTA that relays your mails. Setting up a full fledged mail server for this purpose is overkill; so first here are a few alternatives: ...


1

Every system needs to configure it's resolver, regardless if it's a DNS server or not. This is used by the core library of the OS which will be used whenever any service needs to resolve a name - they just use library function for it which uses this configuration (there might be exceptions when programs do this on their own, but this are rare special ...


3

As you write, it had to work. user1316146 is also right: gethostbyaddr is doing reverse ip lookups, which aren't needed for mail sending. The problem isn't here, on my opinion. I think, you have simply a noisy network or a not really reliable local dns. You had to configure your sendmail to try to get its target address more agressively, and many times. ...


3

gethostbyaddr is performing reverse DNS, so you need to have PTR records set up for the IP addresses in question. You also needs to have that address range delegated to you for public address. If you're using 8.8.8.8 as your DNS for the box, you're not going to be able to have PTR records for the 10.0.0.0/8 network. This lookup usually only occurs for ...



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