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Difficulty: Very hardMobile Device Synchronization and Cloud Integration

A corporate user reports an issue with their mobile device email client. When the user reads, flags, or deletes emails on their desktop computer, the changes are reflected on the mail server. However, when the user performs these actions on their mobile device, the changes do not sync back to the server, and subfolders created on the desktop do not appear on the mobile client. The technician confirms that the mail server supports secure synchronization and port 993 is open across the firewall. Which of the following configuration changes should the technician make on the mobile device to resolve the bidirectional synchronization issue?

  1. Reconfigure the incoming mail protocol setting from POP3 to IMAP using SSL/TLS encryption.Answer
  2. B
    Reconfigure the incoming mail protocol from IMAP to POP3 using secure port 995 to force server copy retention.
  3. C
    Modify the incoming mail protocol settings to use unencrypted IMAP over port 110.
  4. D
    Execute a full remote wipe via Mobile Device Management (MDM) and issue a Mobile Application Management (MAM) profile.

Answer

Reconfigure the incoming mail protocol setting from POP3 to IMAP using SSL/TLS encryption.
IMAP (Internet Message Access Protocol) maintains messages on the server and allows full two-way synchronization. Any action performed on the mobile device (such as reading, deleting, or organizing emails into subfolders) is immediately updated on the server and visible across all other connected clients. Secure IMAP operates over TCP port 993 using SSL/TLS encryption.

Step-by-Step Solution

1
Analyze the symptoms described by the user.
Email actions taken on the mobile device are not syncing back to the server, and folder hierarchies are missing on the device.
These symptoms indicate a one-way synchronization protocol is currently in use.
2
Evaluate the difference between POP3 and IMAP email protocols.
POP3 downloads mail locally and does not support bidirectional status or folder synchronization, while IMAP maintains bidirectional state synchronization with the server over port 993 (implicit SSL/TLS).
Changing the protocol from POP3 to IMAP enables two-way synchronization.
3
Verify server port and security requirements.
Port 993 is confirmed open, which corresponds to secure IMAPS.
Configuring IMAP with SSL/TLS encryption on port 993 fulfills both the functional and security requirements.

Key Concept

Mobile Email Protocol Synchronization (IMAP vs. POP3)
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Topics

Mobile Device Synchronization and Cloud Integration

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