Ports/Protocols: Email

Question 1

EMAIL

SMTP (Simple Mail Transfer Protocol) ======== TCP 25/587

POP3 (Post Office Protocol v3) ============== TCP 110/995

IMAP4 (Internet Message Access Protocol v4) = TCP 143/993

Answer 1

EMAIL

SMTP (Simple Mail Transfer Protocol) ======== TCP 25/587

POP3 (Post Office Protocol v3) ============== TCP 110/995

IMAP4 (Internet Message Access Protocol v4) = TCP 143/993

Question 2

SMTP (Simple Mail Transfer Protocol)

Answer 2

TCP 25/587

• *TCP port 25** (unencrypted email)
• *TCP port 587** (encrypted TLS)

TCP port 465 (encrypted SSL – deprecated/reassigned)

(Transmission Control Protocol)

Question 3

POP3 (Post Office Protocol v3)

Answer 3

TCP 110/995

TCP port 110 (unencrypted)
TCP port 995 (encrypted)

(Transmission Control Protocol)

Question 4

IMAP4 (Internet Message Access Protocol v4)

Answer 4

TCP 143/993

TCP port 143 (unencrypted)
TCP port 993 (encrypted)

(Transmission Control Protocol)