For security reasons, you've created a script on a server that checks whether any non-domain accounts have been added to the local Administrators group. The script is set to email a report each time it runs.
The script uses SMTP for its outbound mail. Which network port must be open so the message can be sent?
25
23
110
143
SMTP uses well-known TCP port 25 for transferring email between mail servers and for any device that relays mail directly to an SMTP host. If this port is blocked by a local firewall or upstream security device, the script will be unable to establish the SMTP session and the report email will fail. (Although modern clients often submit mail on ports 465 or 587, CompTIA A+ identifies 25 as the required port for basic SMTP communication.)
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