Simple Mail Transfer Protocol (SMTP) is a protocol, which handles sending e-mail and routing e-mail between mail servers. Show
Python provides smtplib module, which defines an SMTP client session object that can be used to send mail to any Internet machine with an SMTP or ESMTP listener daemon. Here is a simple syntax to create one SMTP object, which can later be used to send an e-mail − import smtplib smtpObj = smtplib.SMTP( [host [, port [, local_hostname]]] ) Here is the detail of the parameters −
An SMTP object has an instance method called sendmail, which is typically used to do the work of mailing a message. It takes three parameters −
ExampleHere is a simple way to send one e-mail using Python script. Try it once − #!/usr/bin/python import smtplib sender = '' receivers = [''] message = """From: From Person <> To: To Person <> Subject: SMTP e-mail test This is a test e-mail message. """ try: smtpObj = smtplib.SMTP('localhost') smtpObj.sendmail(sender, receivers, message) print "Successfully sent email" except SMTPException: print "Error: unable to send email" Here, you have placed a basic e-mail in message, using a triple quote, taking care to format the headers correctly. An e-mail requires a From, To, and Subject header, separated from the body of the e-mail with a blank line. To send the mail you use smtpObj to connect to the SMTP server on the local machine and then use the sendmail method along with the message, the from address, and the destination address as parameters (even though the from and to addresses are within the e-mail itself, these aren't always used to route mail). If you are not running an SMTP server on your local machine, you can use smtplib client to communicate with a remote SMTP server. Unless you are using a webmail service (such as Hotmail or Yahoo! Mail), your e-mail provider must have provided you with outgoing mail server details that you can supply them, as follows − smtplib.SMTP('mail.your-domain.com', 25) Sending an HTML e-mail using PythonWhen you send a text message using Python, then all the content are treated as simple text. Even if you include HTML tags in a text message, it is displayed as simple text and HTML tags will not be formatted according to HTML syntax. But Python provides option to send an HTML message as actual HTML message. While sending an e-mail message, you can specify a Mime version, content type and character set to send an HTML e-mail. ExampleFollowing is the example to send HTML content as an e-mail. Try it once − #!/usr/bin/python import smtplib message = """From: From Person <> To: To Person <> MIME-Version: 1.0 Content-type: text/html Subject: SMTP HTML e-mail test This is an e-mail message to be sent in HTML format <b>This is HTML message.</b> <h2>This is headline.</h2> """ try: smtpObj = smtplib.SMTP('localhost') smtpObj.sendmail(sender, receivers, message) print "Successfully sent email" except SMTPException: print "Error: unable to send email" Sending Attachments as an E-mailTo send an e-mail with mixed content requires to set Content-type header to multipart/mixed. Then, text and attachment sections can be specified within boundaries. A boundary is started with two hyphens followed by a unique number, which cannot appear in the message part of the e-mail. A final boundary denoting the e-mail's final section must also end with two hyphens. Attached files should be encoded with the pack("m") function to have base64 encoding before transmission. ExampleFollowing is the example, which sends a file /tmp/test.txt as an attachment. Try it once − #!/usr/bin/python import smtplib import base64 filename = "/tmp/test.txt" # Read a file and encode it into base64 format fo = open(filename, "rb") filecontent = fo.read() encodedcontent = base64.b64encode(filecontent) # base64 sender = '' reciever = '' marker = "AUNIQUEMARKER" body =""" This is a test email to send an attachement. """ # Define the main headers. part1 = """From: From Person <> To: To Person <> Subject: Sending Attachement MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=%s --%s """ % (marker, marker) # Define the message action part2 = """Content-Type: text/plain Content-Transfer-Encoding:8bit %s --%s """ % (body,marker) # Define the attachment section part3 = """Content-Type: multipart/mixed; name=\"%s\" Content-Transfer-Encoding:base64 Content-Disposition: attachment; filename=%s %s --%s-- """ %(filename, filename, encodedcontent, marker) message = part1 + part2 + part3 try: smtpObj = smtplib.SMTP('localhost') smtpObj.sendmail(sender, reciever, message) print "Successfully sent email" except Exception: print "Error: unable to send email" What type of attacks use every possible letter number and character found on a keyboard when cracking a password?Brute Force
Brute force password attacks utilize a programmatic method to try all possible combinations for a password. This method is efficient for passwords that are short in string (character) length and complexity.
Which format can most packet analyzer tools read?pcap files are the most common and are generally compatible with a wide range of network analyzers and other tools. . pcapng builds on the simple . pcap format with new fields and capabilities and is now the default format when saving files in Wireshark.
Is defined as hiding messages in such a way that only the intended recipient knows the message is there?Steganography (/ˌstɛɡəˈnɒɡrəfi/ ( listen) STEG-ə-NOG-rə-fee) is the practice of concealing a message within another message or a physical object. In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video.
In what type of email programs can the user copy an email message by dragging the message to a storage medium?Chapter 6-13 multiple choice. |