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Difficulty: HardMobile Application Support and Security Settings

A logistics enterprise recently migrated its mobile infrastructure to enforce secure encrypted channels across all communication services. Field operations staff report that while their tablet mail applications can send outgoing messages without issue, incoming email fails to update when connected to outside networks. Network telemetry indicates that the mobile app is attempting to connect to the mail server on TCP port 143, which is blocked by the gateway firewall under the new security baseline. Which configuration change must be applied to the mobile mail profile to restore secure incoming message synchronization?

  1. Update the incoming mail server connection to use IMAP with SSL/TLS encryption on TCP port 993.Answer
  2. B
    Change the incoming mail protocol to unencrypted POP3 operating over TCP port 110.
  3. C
    Switch the mobile client incoming mail settings from IMAP to POP3 on TCP port 995 to download inbox items directly.
  4. D
    Issue a full remote MDM wipe command to clear the SIM card IMSI subscriber registry and refresh network credentials.

Answer

Update the incoming mail server connection to use IMAP with SSL/TLS encryption on TCP port 993.
Updating the incoming mail profile to use IMAP over SSL/TLS on TCP port 993 provides full transport layer encryption while preserving multi-device mailbox synchronization. This directly addresses the firewall restriction blocking unencrypted port 143 connections.

Step-by-Step Solution

1
Analyze the reported symptom and network telemetry.
Identified that outgoing mail functions properly, but incoming mail traffic is hitting TCP port 143, which is an unencrypted IMAP port blocked by firewall security policies.
Unencrypted IMAP (port 143) transmits credentials and message body data in cleartext, failing enterprise security requirements.
2
Determine the appropriate secure replacement protocol and port for incoming mail synchronization.
IMAP secured with implicit SSL/TLS operates on standard TCP port 993.
Port 993 establishes an encrypted TLS session prior to credential exchange, fulfilling security policy while retaining IMAP folder synchronization across devices.
3
Apply the secure port and protocol setting to the application profile.
The mobile email app securely connects to port 993 and resumes receiving synced email messages.
Reconfiguring the application profile corrects the network target without disrupting other operating system functionality or unencrypting data.

Key Concept

Secure Mobile Email Configuration (IMAP over SSL/TLS)
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Topics

Mobile Application Support and Security Settings

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