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1answer
132 views

SSH to a server with multiple reverse DNS entries [duplicate]

While SSHing into my server with an RSA key, I get this message: Address 255.100.236.105 1 maps to a1.example.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT! Even ...
1
vote
3answers
456 views

Sending an Email from 2 Mail Servers

We are currently attempting to move away from using a "local" mail(exchange) server to an cloud based offering for all our automated emails. The problem is that we send and receive thousands for ...
0
votes
3answers
215 views

How to get from a name server all A records pointing to a specific IP

How can I get from a specific name server, say ns.example.com, all A records pointing to a specific IP x.y.z.w ?? I've been trying with reverse DNS lookup tools, but I cant manage to get what I need. ...