A user wants mail to stay on the server and appear on a phone and a laptop. Which port does that retrieval protocol use?
Select an answer to reveal the explanation.
Short Explanation
You want one mailbox to stay on the server so your phone and laptop can show the same messages. IMAP uses TCP port 143; TCP port 110 typically downloads mail, while ports 25 and 445 are for mail transfer and file sharing, not reading your mailbox.
Full Explanation
IMAP lets you read mail while leaving it on the server, so your phone and laptop can show the same mailbox. IMAP uses TCP port 143. TCP port 110 is used by POP3, which typically downloads mail and may remove it from the server, so it is not the right fit for several devices sharing one mailbox. TCP port 25 is used by SMTP to transfer mail between servers or submit it; it is not how a phone reads a mailbox. TCP port 445 is used for SMB file sharing and does not retrieve mail. Exam caveat: a provider may also offer IMAP over a protected port, but the protocol you need is still IMAP. Practical check: configure both devices for IMAP, read a message on one, and confirm it remains in the mailbox and appears on the other. Leave one message unread and check that both devices show it as unread; record the result on the ticket before closing the call.