E-mail authentication is the effort to equip messages of the e-mail transport system with enough verifiable information, so that recipients can recognize the nature of each incoming message automatically. It differs from content filtering.

Rationale

Ensuring a valid identity on an e-mail has become a vital step in stopping spam (as e-mail can be filtered based on such an identity), forgery, fraud, and even more serious crimes. The Simple Mail Transfer Protocol (SMTP) is continuously evolving, but when it was designed, in the early 1980s, it was the purview of academia and government agencies, and as such, there was no cause to consider security. It provided for no formal verification of sender.

Signing e-mails is a good first step towards identifying the origin of the message, but it does not establish whether that identity has a good reputation or whether it should be trusted.

This article explains how e-mail identities are forged and the steps that are being taken now to prevent it.

From Wikipedia under the GNU Free Documentation License
Fri Jul 16 23:39:34 2010

My camedia pro programme will not send pictures by e mail without SMTP authentication, how do i achieve this?
Q. My camedia pro programme will not send pictures by e mail without SMTP authentication, how do i achieve this?
Asked by AA B - Sun Aug 26 19:13:50 2007 - - 1 Answers - 0 Comments

A. If you are trying to send or receive via yahoo mail you will need to subscribe to yahoo mail plus. Without this you can only send and receive via the yahoo web site.
Answered by steelfixer - Mon Aug 27 06:07:17 2007

i want to order for this e-mail web site;diplomats@nmia-authe ntications@internal-affai rs.com?
Q. Please kindly help me through this e-mail and web site i want to order for, i will be so glad if you can make it easier for me to have the e-mail and web site on time. Regard S.Fishre
Asked by fisher - Sun Jul 13 14:09:53 2008 - - 1 Answers - 0 Comments

A. Actually you need to reserve the domain name You can do this at www.godaddy.com Then, when you have purchased the domain name, you can attach email address to the domain name Easy and not very expensive
Answered by jwishz - Tue Jul 15 13:42:38 2008

The message could not be sent because the server rejected the sender's e-mail ...?
Q. The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was 'BKRENNING4@COMCAST.NET'. Subject 'Fw: howdy', Account: 'Laptop', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '550 5.1.0 Authentication required', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78
Asked by Kristine - Wed May 12 18:23:03 2010 - - 1 Answers - 0 Comments

A. You probably won't be able to use a FREE Yahoo account in that way. Here's the settings for the PAID version Yahoo Mail Plus: Incoming mail server settings * POP server: plus.pop.mail.yahoo.com * Use SSL * Port: 995 Outgoing mail server (SMTP) settings * SMTP server: plus.smtp.mail.yahoo.com * Use SSL * Port: 465 * Use authentication * Account Name/Login Name: Your Yahoo! Mail ID (your email address without the "@yahoo.com", for example, testing80 ) * Email Address: Your Yahoo! Mail address (for example, testing80@yahoo.com) * Password: Your Yahoo! Mail password Upgrade first by clicking Options > Mail Plus > Upgrade Now > enter your payment details for annual fee of $19.99
Answered by An..... - Thu May 13 01:42:31 2010

From Yahoo Answer Search: "E-mail authentication"
Tue Jun 22 12:32:45 2010

See also:

  • PostiniPostini
    google.com
    In-line infrastructure for pre-processing email messages in real time. Allows email management applications to be integrated into any SMTP email system.
  • SlugmailSlugmail
    slugmail.com
    An email based reminder service.
  • MailTester.comMailTester.com
    mailtester.com
    Online tool to test an e-mail address. Find out if is valid, why it bounces or what type of mailserver the mailbox is on.
Custom search only E-mail authentication sites:

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Tue Jul 20 04:13:56 2010
authentication gif
advoca.com
authentication gif
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[source page]

Click on the Servers Tab at the top and then you will be moved to a screen that looks like this Make sure that the account name is the entire e mail address and then click on the My server requires authentication tab

Email AuthenticationDialog gif
shavlik.com
Email AuthenticationD​ialog gif
350px x 550px | 6.70kB

[source page]

The E Mail Authentication dialog enables you to specify the credentials required to send e mail messages

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dslreports.com
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[source page]

Authentication required said by rag133

From Yahoo Image Search: "E-mail authentication"
Fri Jul 2 11:13:55 2010

Samsung S5600 Blade - email problem - Mobile Banter
mobilebanter.co.uk
Samsung S5600 Blade - email problem - Mobile Banter

Petert

Sat, 27 Feb 2010 09:50:32 GM

530 . Authentication.​ required -- |Bob Pullen Broadband Solutions for |Support Home & Business @ |Plusnet Plc. www.plus.net +--- twitter.com/plu​snet ---. Report this post as spam, offensive or inappropriate . ... Vodafone . email. account from her laptop and a 1and1 account from her phone. She accesses her 1+1 account from her laptop using 1+1's IMAP and SMTP servers. On her Samsung we've set it up such that she uses 1+1's IMAP server ...

ThirdFactor | Biometrics a desire for next gen phones
thirdfactor.com
ThirdFactor | Biometrics a desire for next gen phones

unknown

Fri, 19 Feb 2010 22:25:00 GM

Subscribe. To subscribe for free to our weekly . email. newsletters and print magazines, enter your . email. below. Or, find out more ... 50%Swiss bank selects VASCO to supply e-banking . authentication.​ February 25. 99%Shanghai, China Unicom join up to boost cultural industry innovation February 25. 56%Todos AB's new products creates portable . authentication.​ February 25. 99%AllTrust tackles customer service with biometrics February 22 ...

HOWTO: Setup E - mail Notification on Panasonic BB and BL Cameras ...
networkwebcams.com
HOWTO: Setup E - mail Notification on Panasonic BB and BL Cameras ...

Simon

Wed, 17 Feb 2010 17:16:58 GM

This guide walks you through setting up . email. notification on a Panasonic IP camera with a Lavabit . email. account. The shots in this guide are from a Panasonic BL-C131 but should be almost the same for all BL or BB range Panasonic IP cameras . ... want to receive the notification; Subject: Camera has detected motion (or whatever you want the . email. subject to read); Text: Enter whatever you want the text of the . email. to read. How to . authenticate. : Select 'SMTP . authentication.​ ' ...

From Google Blog Search: "E-mail authentication"
Tue Jun 22 12:32:44 2010