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Installation

常用的寄送 mail 套件：

    mailutils: 支援 HTML 格式的郵件，不支援外部 SMTP 連線 Heirloom-mailx: RHEL 7/8 內建指令，不支援 HTML 格式的郵件，有支援連線外部 SMTP server。 BSD-mailx: 支援 HTML 格式的郵件，不支援外部 SMTP 連線 Mutt: 支援 HTML 格式的郵件 Sendmail: 支援 HTML 格式的郵件，不支援外部 SMTP 連線 
    sudo apt install mailutils        # [On Debian, Ubuntu and Mint]
sudo yum install mailx            # [On RHEL/CentOS/Fedora and Rocky Linux/AlmaLinux]
sudo emerge -a mail-client/mailx  # [On Gentoo Linux]
sudo pacman -S mailutils          # [On Arch Linux]
sudo zypper install mailutils     # [On OpenSUSE]

    Alternative mailx

    Debian 系統預設 mailx 為 heirloom-mailx，因為無法寄送 HTML Mail 格式，想改成 mailutils。

    root@A2B:~/bin# dpkg --get-selections | grep mail
bsd-mailx					deinstall
heirloom-mailx					install
libmail-sendmail-perl				install
libmailtools-perl				install
libmailutils4					install
mailutils					install
mailutils-common				install

root@A2B:~/bin# update-alternatives --display mailx
mailx - auto mode
  link currently points to /usr/bin/heirloom-mailx
/usr/bin/heirloom-mailx - priority 60
  slave Mail: /usr/bin/heirloom-mailx
  slave Mail.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
  slave mail: /usr/bin/heirloom-mailx
  slave mail.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
  slave mailx.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
/usr/bin/mail.mailutils - priority 30
  slave mail: /usr/bin/mail.mailutils
  slave mail.1.gz: /usr/share/man/man1/mail.mailutils.1.gz
  slave mailx.1.gz: /usr/share/man/man1/mail.mailutils.1.gz
Current 'best' version is '/usr/bin/heirloom-mailx'.

root@A2B:~/bin# update-alternatives --config mailx
There are 2 choices for the alternative mailx (providing /usr/bin/mailx).

  Selection    Path                     Priority   Status
------------------------------------------------------------
* 0            /usr/bin/heirloom-mailx   60        auto mode
  1            /usr/bin/heirloom-mailx   60        manual mode
  2            /usr/bin/mail.mailutils   30        manual mode

Press enter to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/bin/mail.mailutils to provide /usr/bin/mailx (mailx) in manual mode

    驗證套件版本

    root@A2B:~/bin# update-alternatives --display mailx
mailx - manual mode
  link currently points to /usr/bin/mail.mailutils
/usr/bin/heirloom-mailx - priority 60
  slave Mail: /usr/bin/heirloom-mailx
  slave Mail.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
  slave mail: /usr/bin/heirloom-mailx
  slave mail.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
  slave mailx.1.gz: /usr/share/man/man1/heirloom-mailx.1.gz
/usr/bin/mail.mailutils - priority 30
  slave mail: /usr/bin/mail.mailutils
  slave mail.1.gz: /usr/share/man/man1/mail.mailutils.1.gz
  slave mailx.1.gz: /usr/share/man/man1/mail.mailutils.1.gz
Current 'best' version is '/usr/bin/heirloom-mailx'.

root@A2B:~/bin# mail --version
mail (GNU Mailutils) 2.99.97
Copyright (C) 2010 Free Software Foundation, inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

    Text Mail

    echo "MAIL BODY" | mail -s 'MAIL SUBJECT' receiver@domain_name

# Enter DOT or Ctrl-d to exit the CLI
mail -s "Test mail" receiver@domain_name

    HTML Mail

    NOTE: RHEL 7+ 的 mailx 指令無法寄送 HTML 格式的郵件。

    mailx (舊版)
    echo "<b>HTML Message goes here</b>" | mail -s "$(echo -e "This is the subject\nContent-Type: text/html")" receiver@domain_name
    sendmail
    echo "FROM: info@mediasystemsfl.com
To: $email
Subject: $subject
Content-Type: text/html; charset=utf-8

<!DOCTYPE html>
<html><head>
<title>$subject</title>
<body>
<pre>
### Attention: Do not reply to this message. ###

$(Show_head)

$(Gen_asr_report)

NOTE: The symbol '<<<' indicates an ASR(Answer-Seizure Ratio) of less than $thre%. 

</pre>
</body>
</html>
" | /usr/sbin/sendmail -t
    mutt on RHEL 7
    echo "<b>HTML Message goes here</b>" | mutt -s "Test HTML Mail" -e "my_hdr Content-Type: text/html" user@my.com

    Functions

    
# Show_head & Gen_asr_report are custom functions.
Send_mail() {
    subject="This is Mail Subject"
    email="user@email.com"
    echo -e "
### Attention: Do not reply to this message. ###

$(Show_head)

$(Gen_asr_report)

NOTE: The symbol '<<<' indicates an ASR(answer-seizure ratio) of less than $thre%.
    " | /usr/bin/mail -s "$subject" "$email"
}

    Via SMTP Server

    RHEL 7/8 內建的 Heirloom-mailx 支援不需要使用本地的 MTA 服務就可以外寄郵件。

    一般沒有認證與加密的 SMTP

    mail -v -S smtp=smtp://192.168.21.7:25 -s "Test SMTP" user@domain.tld

    認證且有加密的 SMTP

    新增 ~/.mailrc 或全域環境 /etc/mail.rc (以 Gmail 為例)

    set smtp-use-starttls
set ssl-verify=ignore
set smtp=smtp://smtp.gmail.com:587
set smtp-auth=login
set smtp-auth-user=$FROM_EMAIL_ADDRESS
set smtp-auth-password=$EMAIL_ACCOUNT_PASSWORD
set from="$FROM_EMAIL_ADDRESS($FRIENDLY_NAME)"

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