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Difficulty: HardMobile Device Wireless and Network Connectivity

A remote worker setting up corporate email on a smartphone reports two issues: new emails only arrive when manually requested, and sent messages fail with a delivery timeout error. Investigation reveals the client was configured using POP3 on port 110 for incoming mail and unencrypted SMTP on port 25 for outgoing mail. Corporate security policy mandates bidirectional server synchronization across multiple devices and STARTTLS encrypted submission for outbound mail. Which combination of actions should the technician take on the mobile device to resolve these issues?

  1. Reconfigure the incoming mail service to use IMAP (or Exchange ActiveSync) and update the outbound SMTP configuration to use port 587 with TLS encryption.Answer
  2. B
    Retain POP3 for incoming mail while checking 'Leave a copy of messages on server', and update the outgoing SMTP server port to 110.
  3. C
    Change the incoming mail protocol to IMAP on port 465 and set the outgoing SMTP submission port to 993 without encryption.
  4. D
    Provide the mobile carrier with the smartphone's IMSI number instead of its IMEI number to unblock outbound port 25 transmission over the cellular network.

Answer

Reconfigure the incoming mail service to use IMAP (or Exchange ActiveSync) and update the outbound SMTP configuration to use port 587 with TLS encryption.
The correct solution replaces the legacy POP3 protocol with IMAP or Exchange ActiveSync to enable full two-way synchronization across all user devices. Additionally, changing the outbound SMTP server port from unencrypted port 25 to port 587 with TLS encryption ensures secure message delivery while bypassing cellular network blocks on port 25.

Step-by-Step Solution

1
Identify the synchronization requirement for multi-device mail management.
POP3 only downloads messages from the inbox and does not synchronize read state or sent folders across devices. IMAP or Exchange ActiveSync must be used instead.
Corporate policy requires bidirectional synchronization so changes made on the mobile device reflect on desktop and web clients.
2
Identify the proper secure outbound mail submission protocol and port.
Unencrypted SMTP on port 25 is frequently blocked by cellular providers and lacks encryption. Port 587 with STARTTLS/TLS encryption is the standard for secure client-to-server submission.
Updating the port to 587 with TLS satisfies corporate security standards and prevents carrier port 25 blocking.

Key Concept

Mobile email protocol selection (IMAP vs. POP3) and secure network port assignment (SMTP 587 vs 25).
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Topics

Mobile Device Wireless and Network Connectivity

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