• 목록
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

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.

If you have MX records for multiple services, the email will be delivered to the service with the highest priority (lowest value). If you have other MX records, you should either delete them or make sure mail.protonmail.ch‘s priority is a smaller number (higher priority) than the other MX records. Again, it may take up to a day for MX changes to propagate, and email may still go to your old MX during this transition. Once we detect your domain’s top MX record is pointing to Proton Mail, the MX tab will show a green tick icon. If you are changing an existing domain to deliver emails to your Proton Mail inbox, you should set up all existing email addresses before filling in the MX records (as described above). Select the Address tab → Add address. This will take you to the Organization section of your Proton Mail accounts page. Click on Add Address to create a Proton Mail email address using your custom domain.

DNS can be a confusing and complicated system. If you get something wrong in your set up, your email may start bouncing, or your website might stop working, and it can take hours or days to fix. For that reason, unless you understand what you're doing, or have been instructed explicitly by someone who knows what they're doing, we recommend that you don't modify the DNS for your domain. The process of converting a domain name to a machine to contact is called a "lookup". Each domain can have multiple different result types for a lookup, called "record types". The three most common record types are NS records, A records, and MX records. NS (name server) record lookups are used to work out what machine to contact for other record lookups. Generally when you register a domain, you need to specify the name servers to use for that domain, which are then used for all other record lookups. Each A record lookup returns an IP address which identifies a specific machine on the internet to contact to get the webpage.

1. Top-level domain (com). 2. Second-level domain (phoenixnap). DNS servers have a hierarchical tree-like structure. Every domain has one or more authoritative DNS servers that store information about the domain. The topmost nodes in the structure contain the root servers, which are responsible for resolving top-level domains. DNS resolvers are the client components that contact a DNS server to get an address resolution for a domain name. The resolver is an indirectly used system component (e.g., through a browser). Typically, a DNS resolver stores one or two addresses of DNS servers. When a web browser sends a request to resolve a domain name into an IP address, the DNS goes through a lookup process. 2. The resolver sends a request to the root nameserver to ask for the top-level domain resolution. 3. The root server responds with an IP address of a top-level domain server for resolving .com domains. 4. The resolver sends a request to the top-level domain server.

Have you ever wanted to query the Domain Name System (DNS) to discover what information it holds about your domain? Do you have some important changes to make to your DNS records and need a way to verify your changes? Here’s how to check your DNS records with a tool called dig. DNS is an Internet service that translates domain names into IP addresses. Each time you use a domain name, DNS translates the name into the corresponding IP address. In order to do the translation DNS holds records for each domain. The most important are the A, CNAME, and MX records. The A record stores the host IP address. The CNAME is an alias record, which is used to give multiple aliases to a single computer. The MX record is the mail exchange record, which tells mail servers how to route email for this domain. To query DNS and see the records it holds, you can use a software tool called dig that queries DNS servers directly.