SK0-004 · Question #145
A technician has completed the installation and configuration of a third email server. The technician has configured the firewall to permit email traffic, but the mail is only being received by the…
The correct answer is D. Update the MX record in DNS. MX (Mail Exchanger) records in DNS control which servers are authorized to receive email for a domain. A new mail server must be added to the DNS MX records before external senders can route email to it.
Question
A technician has completed the installation and configuration of a third email server. The technician has configured the firewall to permit email traffic, but the mail is only being received by the two older servers. Which of the following should the technician configure to ensure incoming email will be processed by all three servers?
Options
- AEnable NTP to ensure all three servers are synchronized.
- BConfigure IMAP on the new mail server.
- CAdd the DNS server option in DHCP.
- DUpdate the MX record in DNS.
How the community answered
(17 responses)- A6% (1)
- B6% (1)
- C12% (2)
- D76% (13)
Why each option
MX (Mail Exchanger) records in DNS control which servers are authorized to receive email for a domain. A new mail server must be added to the DNS MX records before external senders can route email to it.
NTP synchronizes system clocks between servers but has no influence on how inbound email is routed or which servers are designated as mail exchangers.
IMAP is a protocol that allows email clients to retrieve messages already delivered to a mailbox and does not affect how inbound SMTP traffic is directed to mail servers.
The DNS server option in DHCP tells clients which DNS server to use for lookups, but it does not modify MX records or change how email is routed between servers.
MX records in DNS specify which mail servers are responsible for accepting inbound email for a domain, and each server must have its own MX entry to be reachable by remote senders. When the third server was added, no MX record pointed to it, so all MX lookups by external servers continued resolving only to the two existing hosts. Adding an MX record for the new server causes sending mail servers to include it when distributing email delivery.
Concept tested: DNS MX record configuration for multi-server mail routing
Source: https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-with-domains/create-dns-records-at-any-dns-hosting-provider
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