System administrators generally use the sendmail or mail utility from mailx to send emails. Which automatically send the email from username@hostname. But there are times when you want to send email from external email server and it requires SMTP authentication. Python is a very powerful scripting language and we can use this below simple script send SMTP authenticated emails.
#!/usr/bin/python
import smtplib
email_to = 'emailto@gmail.com'
username = 'username@sender-domain.com'
password = 'password of username@sender-domain.com'
smtpserver = smtplib.SMTP("sender-domain.com",25)
smtpserver.ehlo()
smtpserver.login(username,password)
header = 'To:' + email_to + '\n' + 'From: ' + username + '\n' + 'Subject: Python SMTP Auth\n'
msg = header + '\n\n This is a test message generated from python script \n\n'
smtpserver.sendmail(username, email_to, msg)
smtpserver.close()
print 'Email sent successfully'
