Shulou(Shulou.com)06/03 Report--

Use the mail command

The mail command is part of the mailutils (On Debian) or mailx (On RedHat) package, which we can use to send messages on the command line.

If your system does not have the mail command installed, you can install it in the following ways:

$sudo apt-get install mailutils (On Debian)

# yum install mailx (On RedHat or CentOS)

Now let's use the mail command to send an email with an attachment, as follows:

Echo "enter your email content here" | mail-s "email title"-a file.txt 59090939@qq.com

Of course, we can save the contents of the message to a file, such as the following: we store the contents of the message in a message.txt file and send it:

Mail-s "email title"-a file.txt 59090939@qq.com

< message.txt 这时候的message.txt是以文本内容在邮件中显示的，并不是以附件的形式。 我们在发送附件的时候出现下面的错误： send-mail: fatal: xiao(40010): message file too big 从上面的错误信息可以看出，我们发送的附件太大了，我们可以通过以下两种方法来加大附件大小的限制： 第一种： [root@xiao ~]$ postconf message_size_limit message_size_limit = 51200000 echo "message_size_limit = 102400000" >

> / etc/postfix/main.cf & & service postfix reload

Reloading Postfix configuration...done.

The second kind:

[root@xiao] $postconf-e message_size_limit=302400000

[root@xiao ~] $service postfix restart

Shutting down postfix: [OK]

Starting postfix: [OK]

[root@xiao ~] $postconf message_size_limit

Message_size_limit = 302400000

Both methods can be set

Configure mailbox account

Vi / etc/mail.rc adds one of the following two paragraphs at the end of the document. The first paragraph is generally fine for domestic IP, and the second paragraph is used for some foreign IP, which has a higher security level.

Set from=59090939@qq.com

Set smtp= "smtp.qq.com"

Set smtp-auth-user= "59090939@qq.com"

Set smtp-auth-password= "ttvingav"

Set smtp-auth=login

Or

Set from=59090939@qq.com

Set smtp= "smtp.qq.com:587"

Set smtp-auth-user= "59090939@qq.com"

Set smtp-auth-password= "ttvingavu"

Set smtp-auth=login

Set smtp-use-starttls

Set nss-config-dir=/etc/openldap/certs

Use the mutt command

Mutt is a popular lightweight email client command, http://www.mutt.org/

We can also use it to send mail with attachments. If this command is not installed on your computer, please use the following command to install it:

$sudo apt-get install mutt

# yum install mutt

Source code installation

Wget ftp://ftp.mutt.org/pub/mutt/mutt-1.11.2.tar.gz

Tar-zvxf mutt-1.11.2

Cd mutt-1.11.2

. / configure-prefix=/usr/local/mutt-enable-pop-enable-smtp-with-ssl-with-sasl

-- enable-pop enables pop

-- enable-smtp enables smtp

-- with-ssl-- with-sasl must use more secure encryption when the above protocol is enabled

Installation

Make & & make install

Because the test account is QQ mail, qq mail requires a ssl secure connection when using the smtp protocol, while a secure connection is used in mutt

Sasl encryption is also required, so the above two security components have to be added when compiling and installing. Otherwise, when you send an e-mail,

"SMTP authentication requires SASL" or another error related to ssl occurred

Add the following at the end of the configuration mailbox account vi / etc/Muttrc file

Set use_from=yes

Set use_envelope_from=yes

Set realname= "59090939"

Set from= "59090939@qq.com"

Set smtp_pass= "ttvingavu"

Set smtp_url= "smtps://59090939@smtp.qq.com:465/"

If port 465 is used in China, the error will be reported as follows when using 587:

Gnutls_handshake: an unexpected TLS packet was received.

Unable to send this letter

Now we can use the mutt command to send mail with attachments:

Echo "enter your email content here" | mutt-s "email title"-a file.txt 59090939@qq.com

As you can see from the above, the use of mutt is very similar to the mail command, and more about its usage parameters can be viewed directly by man mutt.

Use msmtp

Cloud installation

$sudo apt-get install msmtp

# yum install mstp

Installation in source mode

Https://marlam.de/msmtp/

Wget https://marlam.de/msmtp/releases/msmtp-1.8.1.tar.xz

Xz-d msmtp-1.8.1.tar.xz

Tar-xvf msmtp-1.8.1.tar

Cd msmtp-1.8.1

Yum-y install gnutls gnutls-devel gnutls-utils openssl openssl-devel libidn libidn-devel

If there is no yum instll, then the quarterly report may be wrong as follows:

Msmtp: support for TLS is not compiled in

. / configure-prefix=/usr/local/msmtp-sysconfdir=/usr/local/msmtp/etc-with-ssl=openssl & & sudo make & & sudo make install

Create or edit the msmtp configuration file in the user's home directory. I use the VI editor to achieve this goal

Vi / etc/msmtprc

Account gmail

Tls on

Auth on

Host smtp.gmail.com

Port 587

User user1@gmail.com

From user1@gmail.com

Password *

Or

Account qqmail

Tls on

Auth on

Tls_starttls off

Tls_trust_file / etc/ssl/certs/ca-bundle.crt

Host smtp.qq.com

Port 465

User 59090939@qq.com

From 59090939@qq.com

Password ttvingav

Because the file contains sensitive data such as passwords, you should assign security permissions

Chmod 600 / etc/msmtprc

Test sending email, if nothing happens, it should be able to send email normally.

Echo "hello" | msmtp-a qqmail-C / usr/local/msmtp/etc/msmtprc 59090939@qq.com

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