Module 04. Mail Security Flashcards
What is DNS
Domain Name Service
What are DNS Records?
Record associating domain names with IP address
Where is DNS info stored?
Domain Name Registrar
Are domains owned?
Not owned but reserved.
DNS Queries
Request for info from a client to a server.
DNS Records listed here
MX, NS, A, Cname, TXT
MX record
Mail Exchange Record
NS record
Name Server Record
A record
Address Record
Cname record
Canonical Name Record (Alias)
TXT record
Text Record
Mail Protocol
SMTP(25), POP3(110), IMAP(143)
SMTP
Simple Mail Transfer Protocol (port 25)
POP3
Post Office Protocol (port 110)
IMAP
Internet Message Access Protocol
Email Spoofing
Forging email
DNS Spoofing
Fake DNS records to redirect traffic
DKIM
DomainKeys Identified Mail
Email Validation Technique,
server level
digital signatures
DNS Mail Protection
DKIM, SPF, DMARC
SPF
Sender Policy Framework
Email Authentication Protocol
SPF records store info on which IP can send emails from domain
Does not work when forwarding emails
DMARC
Domain-based, Message, Authentication, Reporting, and Conformance
Check, Monitor, Quarantine, Reject, Report
Mail Header
email metadata
precedes message body
Mail Relay
Server that routes emails to their correct destination.
Provides a way to guarantee message authenticity
Protect IP
Scan File Attachments
Spam phishing, spoofing protection
MTA
Mail Transfer Agent
