Yahoo guidelines for email security

1. Ensure that your email address lists are well maintained.
2. Remove email addresses that bounce. Bounces are an indication that the mail could not be delivered because the user does not exist, no longer exists, or is unable to accept your email. List managers should remove addresses that generate bounces. A particularly popular technique for managing bounces is to use VERP to identify the recipient address that has failed.
3. Examine your retry policies. Messages that receive permanent errors, such as emails sent to accounts that do not exist or are over quota, should not be retried. Permanent errors that are retried increase the likelihood that delivery will not receive the priority it deserves.
4. Pay attention to the bounce notices sent by Yahoo!. In particular, Yahoo! will send “500″ SMTP response codes to indicate problems you need to investigate. For example, if an email is sent to an invalid recipient, our servers will respond with a “500″ range SMTP code, indicating a permanent error.
5. Don’t send unsolicited email. Make sure that all email addresses are confirmed with an opt-in process that ensures the recipient wants to receive your mail. Obtaining permission from a third party to send an email does not ensure the email is solicited. Probably the best way to confirm an email addresses before adding them to a mailing list is by using closed-loop confirmation (sometimes referred to as “full confirmation,” “full verification,” “confirmed voluntary subscription,” or “double opt-in”). In this process, after you receive a subscription request, you send a confirmation email to that address which requires some affirmative action before that email address is permanently added to the mailing list. Since only the true owner of that email address can respond, you will know that the true owner has truly intended to subscribe and that the address is valid.
6. Provide a method of unsubscribing from your list in each email sent.

The following techniques are said by list owners to be effective in resolving yahoo.com delivery problems:

1. Send one small, non-list, “good” email to a yahoo.com address from the same address that has been receiving bounces. If it goes through, you will again be able to send list mail to yahoo.com.
2. Change the From: address on your emails, including a different domain, if possible. [Note: Unless you are using your own IP address with your WebHelps List, even if you are using your own domain, there are several alternate domains you may use when sending mail to/from the list server:
   IMail Lists:
   • whathelps.com
   • webhelps.com
   • webhelps.biz

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4. precaustions for reading email attatchment
5. Is your email private
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