Email Security: Measures on the Server Side as well

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2019-04-28(Updated: 2024-12-10 )
Email MarketingSecurity measuresEmail Delivery Basics

We are here to answer your questions about email security.



Table of Contents [Hide]

1. Types of security for sending and receiving emails
2. Email Security 1: Email Sending and Receiving Protocols
2.1. Between the sending email client loan officer email list and the receiving email server
2.2. Between the receiving mail server and the mail client
3. Email Security 2: Domain Names and Email Servers
3.1. SPF (IP address based method)
3.2. DKIM (Digital Signature-Based Method)
4. Email Security 3: Email Messages
4.1. S/MIME for encrypting email
Types of security for sending and receiving emails
If you are involved in email delivery, you may have heard of security terms such as "SPF," "TLS," and "S/MIME."

We have summarized email security to prevent email-based fraud such as phishing and spoofing.

Various security mechanisms are used when sending and receiving emails.

We will explain each security topic, such as the areas related to communications between mail servers (e.g. SMTPs) and encryption of the email body.





subject
overview
Security Technology
Transmission and reception protocol
Security measures for communication between the sender's mail client and mail server, between mail servers used for delivery, and between the recipient's mail server and the recipient's mail client

SMTPS, IMAPS, POPS
Domain name and mail server
Authentication method based on the domain name of the sending email address
SPF/DKIM
Email Message
Detecting tampering with the email body and authenticating the sender
S/MIME and PGP/MIME






Email Security 1: Email Sending and Receiving Protocols
Simply put, an email sending and receiving protocol is the "procedures and rules for sending and receiving email."

We will introduce the security mechanisms in the transmission and reception protocols.



Between the sending mail client and the receiving mail server
An email created using email software is first sent to the outgoing email server.

The email is then forwarded to the recipient's server, and the email is delivered to the recipient.




The mechanism for data transfer to the recipient's mail server is called SMTP (Simple Mail Transfer Protocol).

In SMTP, the method that uses TLS (Transport Layer Security), which encrypts communication data and protects communications between mail servers from eavesdropping, is called SMTPs.

There are two ways to implement SMTPs: "a method of communicating using SSL from the beginning" and "a method of switching to TLS midway through SMTP (STARTTLS)."