Shulou(Shulou.com)06/01 Report--

SMTP supplement

Maillinux.linux.com host ip:172.25.254.145

Mailwestos.westos.com host ip:172.25.254.245

Real host ip:172.25.254.45

# #

1. Cannot be sent (client hostname / address limit)

Postfix access encrypts files

Filter client

Accept the connection request from the client if the ip address of the client meets the range defined by the $mynetworks parameter

; reject_maps_rbl: reject if the network address of the client matches the value of the $maps_rbl_domains parameter

Connection request for this client)

Client test

two。 Deny an email to a user (restricted by the sender's address)

In the / etc/paostfix/sender file, write to

Find the sender.

Restrict the user if the user is written in the sender file. Cannot send an email and then restart the service

test

3. Cannot be received (filtered by recipient address)

In the / etc/paostfix/recip file, write to

Find the recip.

Regardless of the hostname of the client, the client SMTP is rejected as long as the following conditions are met

test

# #

4.dovecot (tofu cubes)

Install dovecot

Modification of configuration file

Change two places

Change one place

Create a new user and set the password

Create directories and files

Restart the service and find that the port is open

test

Mutt-f pops://westos@172.25.254.245

5. Use Thunderbird to test whether you can receive email on a real machine.

* install Thunderbirds

Just unpack the Thunderbird package, press it and enter the Thunderbird home directory and click on the slash to run thunderbird. You can just yum what is missing.

Since there are many missing packages, write a script

Yum whatprovides $1

every time. After / thunterbird

Software missing from sh script name

* add Thunderbird account

-"right-click" Settings-- "account Operation--" add email account-- "fill in the information:

-- "continue to click OK:

-"at present, our Thunderbird is not encrypted, nor does it need a password:

6. Database connection mailbox

Web page database

Database mail table muser

Create users and give permissions

Query test

Cd / etc/postfix/

Postmap-Q "admin@westos.org" mysql:/etc/postfix/mysql-users.cf

Query test

Vim mysql-domain.cf

Postmap-Q "admin@westos.org" mysql:/etc/postfix/mysql-domain.cf

Query test

Vim mysql-maildir.cf

Postmap-Q "admin@westos.org" mysql:/etc/postfix/mysql-maildir.cf

Virtual users in the database send emails

Groupadd-g 666 vmail

Useradd-g 666-u 666 vmail

Virtual users in the database receive mail

Vim dovecot.conf

Protocols = imap pop3 lmtp

Disable_plaintext_auth = no

Virtual users in the database receive email

Cd / etc/dovecot/

Vim dovecot.conf

Protocols = imap pop3 lmtp

Disable_plaintext_auth = no

Cd conf.d/

Vim 10-auth.conf

Vim 10-mail.conf

test

Telnet 172.25.254.245 110

7. Shell mail

Configure DNS

Vim / var/named/westos.org.zone

Vim / etc/postfix/main.cf

Real host name

Real domain name

Be the empty shell of which domain

Open port 25

If you send an email to the "empty shell", you will get an error.

Don't write anything, because you don't accept any mail as shell mail.

The main server that processes mail

Systemctl restart postfix.service

The server that actually receives mail (MAT mail server)

Vim / etc/postfix/main.cf

Who is the empty shell?

Systemctl restart postfix.service

Test: emails sent to empty shells end up being handled by the MAT server

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