Segregate the IP addresses you use according to what you use them for. Yahoo! Mail keeps reputation data about each IP address you send from. Consumer reports of spam negatively impact an address’s reputation data. Separating an address that delivers marketing mail from another that sends transactional mail (order receipts or billing notices, etc.) – or from another address that sends mail composed by end users – you make it easier for Yahoo! Mail to determine the IP address’ reputation. This way a delivery decision can be made that will …

Multiple DNS implementations vulnerable to cache poisoning

Overview
Deficiencies in the DNS protocol and common DNS implementations facilitate DNS cache poisoning attacks.
I. Description
The Domain Name System (DNS) is responsible for translating host names to IP addresses (and vice versa) and is critical for the normal operation of internet-connected systems. DNS cache poisoning (sometimes referred to as cache pollution) is an attack technique that allows an attacker to introduce forged DNS information into the cache of a caching nameserver. DNS cache poisoning is not a new concept; in fact, there are published …

The DNS server at IP address 202.188.0.132 is susceptible to a DNS cache poisoning attack. The server is not changing its source port, query id, or both, between queries. This means it is easier than average for an attacker to spoof responses to DNS queries from this server, causing the server to serve a potentially malicious DNS record in response to any query.
Click here for more details on this vulnerability and how to patch it.
If you are not in control of your own DNS server, contact your DNS provider but …

“A” record(address record) - returns a 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host.
“MX” record(mail exchange record) - maps a domain name to a list of mail exchange servers for that domain.
“CNAME” record(canonical name record) - is an alias of one name to another, the DNS lookup will continue by retrying the lookup with the new name. This is useful when running multiple services (like an FTP and a webserver) from a single IP address. Each service can then have its own …