Emails I have sent to people that are not spam are being marked as spam.?

If you use Yahoo! mail as your main email account, you might not be receiving all of your emails.

What is Yahoo thinking??? Recently Yahoo has started "greylisting extremely deprioritizing" almost every email that goes through their mail server. Greylisting This is a way of attempting to block SPAM. Yahoo mail denies the first every delivery attempt of an email (451 Message temporarily deferred - 4.16.50) from deprioritized mail servers. They assume that SPAMers don't try sending the same email twice, so they put the ip address of that email server on a list and then if the delivery is retried within a short amount of time, they assume that it is a good email.

Now here is the downside. Do you think that spammers care one wit whether they send a "spammy" email once, twice or a thousand times? No, they don't. All Yahoo is doing is increasing the problem. Now instead of being hit by one SPAM email, you'll get three.

This results in people that have been sending email to the same person for the past 3+ years to suddenly not be able to send email. Even when the sender is "conforming to Internet standard practices.

Also install DomainKeys to help fix the problem Dig a little deeper and you will find that you should install DomainKeys to sign your emails from a specific domain. However, even once this is done, you will still get some 451 errors.

The long and short of it is that you get what you pay for...

- Yahoo is not communicating with administrators even after they submit multiple request forms.

- Yahoo is not delivering messages even though they send the response back that the "message was temporarily deferred" - In an attempt to block spammers, Yahoo is blocking an extremely high number of "good" emails.

Sorry that I cannot answer this as well as the very long and apparently informed person. I experience the same problem and it is madening. I get mails coming through to Korea but I find that many of my mails to businesses that are my suppliers either do not go through or are marked as spam.

I wish I had a good answer as well.