Shulou(Shulou.com)06/02 Report--

1.1.1 Components of an email system

A mail system is a separate system with its own independent server designed to transfer data between computer users. E-mail system includes writing, sending, storing and receiving four aspects, users through the mail server to apply for a mailbox, you can use the e-mail service to send and receive mail, e-mail system consists of two major parts, including MUA and MTA.

1. mail user agent

A mail user agent client is a program that reads and writes mail, accepts various program instructions input by the user, sends the user's mail to the mail server, or reads mail from the mail server to the machine through POP3 or IMAP protocols. Currently common mail user agent software are Foxmail, Outlook.

2. message transfer agent

Mail transfer agent will refer to the letter from MUA, from one computer to another computer program, for example, the user sends an e-mail, MUA will be delivered to the MTA, and then through MAT for forwarding, the mail will be sent to the final recipient, the current common mail transfer agents are Exchange, Q-mail, Send-mail and so on.

1.1.2 Common mail protocols

Mail system uses mail protocol in the process of sending and receiving mail. Through unified mail protocol, different mail servers and mail servers and mail clients can communicate normally. Therefore, understanding mail protocol is one of the important channels to ensure mail security.

SMTP (Simple Mail Transfer Protocol)

SMTP is a standard protocol for the transfer of e-mail on the Internet, specifying the standard exchange format for e-mail transmission and the communication mechanism of e-mail.

Role; used to send e-mail

POP3 (Post Office Protocol, Version 3)

Pop3 is an offline mail protocol that works in client and server mode, C/S mode.

PoP3 allows users to store mail from a server to a local host while deleting software stored on the mail server.

IMAP4 (Internet Message Access Protocol, Version 4)

IMAP4 is a protocol that specifies how personal computers access mail servers on the Internet to send and receive mail. IMAP4 allows clients to access and read mail on servers online or offline, and to interact with mail on servers. With IMAP4, users can selectively download e-mail or even just part of it, so IMAP4 itself is more complex than POP3

1.1.3 Common mail systems

Nowadays, most enterprises use Exchange, Send-mail, Q-mail, etc. to provide mail service.

1.Exchange

Exchange runs in windows environment, characterized by graphical management, simple operation

2.Postfix

Postfix is a mail server running in UNIX/Linux environment with excellent performance in delivery efficiency, stability, service performance and security.

Exchange Server 2010 version

Exchange Server 2010 includes the following two editions

Exchange Server 2010 Standard Edition; primarily for small and medium-sized companies or enterprises, limited to 5 databases per server

Exchange Server 2010 Enterprise Edition; for large enterprises, supports 100 databases per server

Comparison of features between the two versions

characteristics

standard version

Enterprise Edition

number of databases

1-5 of databases

1-100 of databases

clustering feature

not support

support

encrypted transmission

support

support

Remote Management with PowerShell

support

support

Online mobile mailbox

support

support

Planning Exchange Server Roles

Exchange Server 2010 includes the following server roles

Client access server; supports client protocols such as POP3, IMAP4, HTTPS, Outlook Anywhere, and hosts availability services and autodiscovery services, as well as web

Hub Transport servers (also known as hub transport servers); servers that route mail within an Exchange organization

Mailbox server; includes user mailboxes and public folders

Edge transport server; usually located on the perimeter network and responsible for routing mail to and from the Exchange organization

Unified Messaging Server; allows users to access Exchange Server 2010 mailboxes by phone for e-mail, voice mail, fax mail, calendar, contacts, and more.

If Exchange Server 2010 SP3 is typically installed on Windows Server 2008 R2 Sp1 Enterprise Edition systems, you need to determine the following prerequisites in advance

AD domain environment, domain and forest functional level must be Windows Server 2003 or higher.

.NET Franmework 3.5.1 SP1

IIS and Multiple Role Services

RPC over HTTP Proxy

AD DS and AD LDS Tools

application server

Microsoft Filter Pack

Verify that the startup type of the Net.TCP Port Sharing Service is Automatic.

Install patch Windows 6.1-KB2550886-x.64.msu.

Before deploying Exchange Server 2010, systems are not allowed to have Simple Mail Transfer Protocol (SMTP) services or Network News Transfer Protocol (NNTP) services installed.

this chapter summarizes

Exchange Server 2010 comes in two editions; Standard and Enterprise;

Exchange Server 2010 includes five server roles.

Exchange Server 2010 supports two common client types;

Recipients are AD objects that have the ability to send and receive mail.

AD objects for Exchange Server 2010 recipients include users, contacts, and groups.

Through the address list, users can quickly locate mail recipients;

Mail administrators can configure mailbox stores for all users or special users;

class notes

Enterprise mail system management

Deploying and planning mail systems

1. Composition of the email system

1. What is email;

The exchange of information by electronic means is called E-Mail

Email is not an instant message

2. Advantages of email

Low cost; cheaper than sending express

Strong security; encryption and signature support

Diversity of content transmitted; text, images, audio, etc.

Strong controllability; easy data monitoring

3. Composition of mail system

1. MVA Mail User Agent

Read and compose emails, upload or download MTA messages.

2. MTA Mail Transfer Agent

MTA is used to route mail between mail servers, and to transfer e-mail from MUA to target e-mail users. MTA is the mail system that works.

4. Common e-mails

mail protocol

port number

characteristics

SMTP Simple Mail Transfer Protocol

25

Responsible for mail routing, working at MTA

POP3 Post Office Protocol Version 3

110 。995

Mail is downloaded locally, mail server does not copy, works at MUA

IMAP4 Internet Message Access Protocol version 4

143

Selective download mail, flexibility, working at MUA

Microsoft API setup administrator configuration is simple

dynamic

Working at MUA

The client accepts copies of messages retained by the email server

Working at MUA

5. Common email systems

Windows platform;Exchange, Winmail

Linux,Unix platforms;Posfix, sendmail

Exchange rules and roles

1. Exchange 2010 features

Internal component optimization reduces resource footprint

Reduce high availability costs Using DAG

Support online mailbox migration

Support user mailbox archiving

Rights management for RMS documents

mail arbitration

Version of Exchange

Standard version 1-5 databases do not support cluster encryption for data transfer remotely using powershell to migrate mailboxes online

Enterprise version 1-100 databases support cluster encryption remote powershell online migration mailbox

3. Role of Exchange Mail Server

1) Client server role

Perform client authentication

Authorize clients to access mailbox servers

Client high availability using CAS, CAS requires NLV support

2) mailbox service role mailbox

Store all users 'email addresses

Store users 'public folder data

High availability using DAG, DAG requires cluster support

3) Hub Transport Server HT

sorting mail

Mail routing

Set mail transfer policy

High availability using NLB

4) Edge Server Edge

The only mail role working in a workgroup environment

For anti-spam and anti-virus

5) Unified Messaging Server Role UM

Exchange and sync work together requires installation support for sending and receiving mail voice

4. Conditions for deploying Exchange

Domain and forest functional level cannot be lower than Windows Server 2003

Exchange must be in a domain environment

Exchange must be 64 for Server systems

Memory no less than 4GB

File format NTFS

Available disks are no less than 1.2G

5. Exchange Management Tools

EMC; Management Console Core

EMS; using powershell management

ECP;RBAC Role-based access control, to be accessed via browser

Basic configuration of three clients and recipients

Common ways to post emails

OWA browser sends and receives emails;https://IP/owa, https://dc2.benet, local/owa

Use clients to send and receive e-mail;outlook, Foxmail

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.