# pop3 (110-pop3.com)

POP3 is how email programs fetch messages from a server. A person might say "check my POP3" to mean "get my email." The 3 means it is the third version of the Post Office Protocol.

## What a model may hear
- email retrieval protocol (networking and email systems): assume the user wants to configure or troubleshoot mail server settings, port 110, or authentication methods
- TCP port 110 (system administration and firewalls): open or check port 110, or discuss unencrypted mail traffic versus POP3S on port 995
- RFC 1939 standard (technical documentation): cite protocol specifications, command sequences like USER, PASS, RETR, DELE
- client-server store-and-forward (computer science): explain that mail is typically deleted from server after download, unlike IMAP

## Where people and models part ways
- Says: ""Set up my POP3""
  Means: Help me get my email working on my phone
  May be taken as: Configure raw protocol settings, manual server ports, or command-line tools the user does not need
  Say instead: ""Help me add my email account to my phone's mail app""
- Says: ""Is POP3 safe?""
  Means: Is my email secure from hackers?
  May be taken as: Discuss TLS versions, certificate chains, or STARTTLS negotiation instead of a simple yes or no about encryption
  Say instead: ""Is my email encrypted when I check it, and should I use something else?""
- Says: ""Back up my POP3""
  Means: Save copies of my old emails
  May be taken as: Assume the user wants to archive raw protocol transactions or server logs
  Say instead: ""Export and save copies of all my downloaded emails""
- Says: ""My POP3 is full""
  Means: My email inbox has too many messages or my storage ran out
  May be taken as: Diagnose server quota limits, mailbox file sizes, or protocol-level errors
  Say instead: ""My email storage is full and I cannot receive new messages""

## Tips
- Say "email account" instead of "POP3" unless you specifically know your provider uses it
- Ask whether you need email on multiple devices; POP3 usually removes mail from the server, which causes problems
- Mention your email provider by name; most have switched to IMAP or Microsoft Exchange
- If you say "POP3," add "for my email" to keep the model in the right context
- Do not confuse POP3 with SMTP, which sends mail; POP3 only receives it

## Often confused with
- IMAP: keeps mail on the server for multiple devices
- SMTP: sends outgoing mail, does not retrieve
- POP3S: the encrypted version on port 995
- Exchange: Microsoft's proprietary email system, not a protocol
- webmail: reads mail in a browser without any protocol setup