A Brief to DNS Caching
Every time your web browser wants to load a web page, it needs to contact a DNS server first, which will translate thewww.domain.com address into a machine readable format – the IP address. The same thing happens when PostCast Server tries to send a message to a recipient. The domain name in the e-mail address is [...]
Categories: Tech Guru Tags: cache feature, caches, dns cache, dns entry, dns queries, dns server, domain name, ip address, local connection, milliseconds, readable format, recipient, response time, web browser, web page, www domain
How to Specify the Hosts That You Want to Openly Relay to All Domains in Windows
This step is for hosts, which are most likely your internal servers that would need to send to all domains on the Internet. It is not recommended to not have any restrictions because anyone can use your server as an open relay. It is recommended to only allow the minimum, necessary hosts to openly relay [...]
Categories: Windows Tags: dialog box, dns lookup, domain name, host group, hosts, internal servers, ip address, lookup button, octets, open relay, service performance, single computer, smtp host, smtp service, subnet mask, virtual server
How to Configure the SMTP Service to Relay for Internal Domains
Depending on the scenario, it may be necessary to configure the SMTP service to relay inbound messages for your internal domains.
Click Start, point to Programs, click Administrative Tools, and then click Internet Services Manager.
Expand the tree under the server name, and then expand the Default SMTP Virtual Server. By default, you should have a Local (Default) domain with the [...]
Categories: Windows Tags: administrative tools, default domain, dns lookup, domain check, domain name, email, inbound messages, incoming mail, internal domain, internet services manager, ip address, server name, smart host, smtp service, square brackets, virtual server
How to Create Subdomains
Everyone has a "www" subdomain (In "www.yourdomain.com", the "www" part is the subdomain). The www subdomain is created by, and serves files from, your /htdocs/www directory on the filesystem.
Categories: Apache Tags: create, difference, directory, domain name, file, filesystem, filesystems, Generator, shell, sites, subdomain, subdomains, upload
Howto Create a DNSBL to Black Lists well known sources of SPAM
Black Lists are used in the context of email to define the IP addresses or netblocks of well known sources of SPAM. DNSBL defines a method of using standard DNS zone files to store such IP addresses. Standard DNS A RR queries are used to interrogate the black list which is organised as a reverse [...]
Categories: DNS Tags: accesses, attack, black lists, create, dns zone files, dnsbl, domain name, email, es, Identify, incoming, list zone, listing, name server, queries, serial number, servers, smtp, stop, vulnerability
How to Configure Squid as an accelerator/SSL offload for Outlook Web Access
Squid can be easily used to provide SSL acceleration services for Outlook Web Access. It can also speak SSL to the backend Exchange server. Later versions of Squid-2.6 support all the methods used by WebDAV by default. Please consider upgrading to the latest Squid-2.6 STABLE release before attempting this
Categories: Open Source, Squid Tags: backend, configure, domain name, exchange server, https port, outlook web access, squid, squid server
