1. 安装 msmtp

sudo apt-get update
sudo apt-get install msmtp

2 .配置 msmtp

nano ~/.msmtprc

defaults
auth           on
tls            on
tls_starttls   on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
logfile        ~/.msmtp.logaccount        qq
host           smtp.qq.com
port           587
from           your_email@qq.com
user           your_email@qq.com
password       your_password# Set a default account
account default : qq

chmod 600 ~/.msmtprc

3. 测试发送邮件

echo -e "Subject: Test\nThis is a test email." | msmtp -a qq recipient@example.com