Dedicated servers are more reliable, secure, powerful, and feature-rich than the shared or VPS servers . However, you cannot pick a dedicated server hosting provider without doing some deep digging into their capabilities. There are plenty of them out there, but understand, no two services are the same. Dedicated servers are expensive, much higher in cost than the other servers.
Quality of hardware
You are paying a high price and renting a complete server. It is important that your investment gets you the best quality hardware infrastructure that goes into the building of the server.
Make sure you read the SLAs they offer. There must be a commitment so far as the hardware replacements are concerned. Your business performance is at stake if you compromise on quality. The dedicated server hosting provider must also assure about the network uptime of at least Tier 3 standards of 99.98%. This is important. Anything lesser can mean being offline for a longer time which could compel your visitors go to a competitors site.
Dedicated Server Hosting
The software requirements
Choice of operating system
Dedicated servers are offered in Linux and Windows operating system. Although there is no difference in the features, you must choose the operating system based on which technologies your website is built. This is because Linux servers are not compatible with the Microsoft technologies of ASP.NET. in case your business needs these Microsoft technologies, you should not consider Linux but must buy the Windows dedicated server plan. Choose a dedicated server hosting provider that offers you plans in both the operating system. Windows servers cost more than the Linux machines since there is a license fee charged by Microsoft to use the Windows servers.
Tools that you require
Most of the dedicated server providers offer a cPanel control panel with Linux and Plesk control panel with Windows machines. A control panel allows you to manage your websites without much difficulty. You must also ask your hosting company to provide with a 1-click installer, SSDs, dedicated IPs, SSL to speed up and secure your site.
There are different levels of support offered by the hosting services. You must choose a dedicated server hosting provider that extends around the clock technical support. They must be easily reachable in all forms of communication like telephone, live chat, email etc. There are several aspects in the server which can only be handled by the host's team. Your in-house engineers will not have access to those areas. In case you have issues after the working hours, your business can become unavailable till they reopen the next working day.
Another important point is how long is their response time. They must be technically qualified live support team and not an automated service or customer support giving vague replies. If you are upgrading from a lower platform, most hosting services assist you with the upgrade free of cost. You must also find out what support they would extend if you are migrating from another hosting service.
Your online business needs maximum security. The security must be in every form. You must check where the data centers, which will house your servers, are located. They must be in safe zones and not prone to frequent natural disasters.
Another important aspect you must check with the dedicated server hosting provider is how well are they prepared to meet any unexpected outage? Do they have a backup data center to run your applications? What is the physical security being provided at the data centers? The ideal hosting service will offer 24/7 manning of the facility with security officers, CCTV camera monitoring, and entry to server rooms only through biometric cards.
To understand whether it is possible to determine the existence of an email address, it is necessary to understand how the process of sending an email is carried out.
First, let's analyze several basic concepts. An email address consists of two parts, separated by an @ sign: Account name (part of the email address before the @ sign) and Domain name (part of the email address after the @ sign). A domain name is the name associated with the IP address of our server, while the Account name is the unique name of the account within this domain. Domain names exist to provide access to servers, since identifying and storing IP addresses is extremely difficult for a user. Therefore, a domain name was invented for a particular IP address. To provide this connection, there is a Domain Name System / System (DNS). DNS is a server system that associates IP addresses with their domain names. Also inside DNS, there is an identification of domains with their mail servers, or rather, the identification of MX records with domain names. Several MX records can be associated with a single domain, which are the names of its email servers and which, respectively, have their own IP addresses.
So, we looked at the components that make up an email address, the concept of a domain name, MX records, and DNS. Based on this data, we can already perform some checks on the existence of an email. DNS allows us to contact him with the domain name and get a list of all MX records of this domain. If this domain name does not exist in DNS, we will receive an error, and, accordingly, we can conclude that no email addresses with this domain name can ever exist. In the case when the domain name exists, but there is not a single MX record in the DNS, this means that this domain does not have a mail server, and, therefore, no emails with this domain name can ever exist.
Now let's take a closer look at the process of sending an email. Simple Mail Transfer Protocol (SMTP) is used to send an email. Let's look at how SMTP works. The first action performed by any email server to send email to another email server is the connection - Connect. Actually, this is not a protocol command; it creates a communication channel for the subsequent dispatch of commands. The first command sent is HELO. This command is sent to open a dialogue between two servers. When receiving a positive response from the destination server, the process will continue. The following command MAIL FROM includes the sender address parameter. It informs the destination server about the sender's address. If the sender receives a positive response, the dialogue continues. The next command RCPT TO is sent with the parameter "recipient address". If the answer to this command is positive, the process of sending the mail will continue. Next, the sender's server will send the body of the email itself and the documents attached to it, but for our purpose, the completion of this process is not important. Moreover, we need to interrupt the process using the QUIT command to prevent sending the email actually, since we are interested in verification of an email address, and not in sending an email to this address.
Why VERIFY Does Not Work
Can response to VERIFY command be trusted?
I just want to notice that there is a VERIFY command in the SMTP protocol itself; this command was intended to respond to the request about email existence. But, unfortunately, due to the overuse of this command by spammers, today there are practically no servers that will respond truly to this command.
What can be done in this situation? Let's take a closer look at what happens when sending the RCPT TO command. We inform the requested server by this command to which email address we want to send an email. The e-mail address specified in RCPT TO must exist on this server in order the requested server could do this. If this address does not exist, many email servers will return the error "550" to us, which in fact means that they do not have this email address. Actually, this will be the answer to our question whether the given email address exists. But, unfortunately, many servers do not return this error but return a positive response "250", indicating that the request has been accepted. There are also several other responses to the RCPT TO command from the server. For example, we can receive a response that the given email address is full and cannot receive an email at the moment; this corresponds with the "552" code received from the requested server. Another example is "450", which means that this specific email address is not available at this stage, which, in fact, can only be a temporary error and does not mean that the given address does not exist at all. Many other negative responses from the requested server are also possible. It makes sense to consider each of the possible responses of the requested server to decide whether or not an email address exists. Also, your decision may vary depending on your goals. For example, if we return to the answer "the email address is full" - the code "552". If the purpose of your verification is to determine whether the address exists, this answer unequivocally says that the address exists; but if the purpose of your verification is to decide whether to send mail to this e-mail address or not, in the case of such reply (stating that the email address is overfilled), there is no point in sending a mail.
Summarizing the above. In the case of a "550" negative answer to the RCPT TO command, as well as any other additional answers which we will choose as negative for ourselves, we can decide that this email address does not exist. In the case of positive response "250," there is no absolute certainty that the address we are interested in exists. However, you can resort to a certain trick to be more confident in the positive answer "250" of the http://hostingduba.com requested server. To do this, before checking the e-mail address we are