In an email address, what does the @ symbol separate?
AnswerThe user name and the domain
An address like name@example.com has the mailbox name before the @ and the mail domain after it.
Tech · Facts & stats
Email facts & stats
7 fact-checked facts about email, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is phishing?
AnswerA fake message designed to trick people into revealing information
Phishing emails pretend to be trustworthy senders to steal passwords or other sensitive details.
Going deeper
What does SMTP stand for?
AnswerSimple Mail Transfer Protocol
SMTP is the standard protocol used to send email between mail servers.
What is an email 'bounce'?
AnswerA message returned because it could not be delivered
A bounce, or non-delivery report, comes back when a message cannot reach its destination mailbox.
Compared with POP3, what is the main feature of IMAP?
AnswerMail stays on the server and syncs across devices
IMAP keeps messages and folders on the server, so every device shows the same mailbox.
Expert level
What does MIME, the standard that lets emails carry attachments, stand for?
AnswerMultipurpose Internet Mail Extensions
MIME extended email beyond plain text, allowing attachments, images and non-English characters.
Which TCP port was originally assigned to SMTP for server-to-server mail?
Answer25
SMTP was assigned port 25; ports 21, 80 and 443 are used by FTP, HTTP and HTTPS.
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