An IT technician notices that a set of emails sent from the company's newly installed and updated mail server are not being delivered. The mail server is configured to send emails over port 25. Which of the following is the most likely cause of the issue?
A firewall is blocking port 25.
Port 25 is not designed for transferring emails with attachments.
The SMTP server should use port 143 instead.
The mail server requires an update to handle current SMTP security standards.
The most likely scenario in this case is that a firewall needs to be configured to allow the new mail server connectivity over SMTP/port 25. SMTP uses port 25 by default, not port 143 which is the default for IMAP. The question states the server is already updated, and port 25/SMTP can handle attachments. This rules out all but the firewall option, which is a common problem when setting up new devices and servers.
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Why is port 25 commonly blocked by firewalls?
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What is the difference between port 25 and port 143?
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What steps can be taken if port 25 is blocked on a server?