This article discusses steps you can take to help prevent outgoing messages from being marked as spam.
Mail servers use many different techniques to filter spam. Spammers constantly adapt to these anti-spam measures, so administrators have to continually modify server configurations to help reduce spam. As a result, there is no single thing you can do to ensure that all of your outgoing messages are delivered successfully.
Nevertheless, there are still some things you can do to help improve the odds of successful delivery. Try the following techniques:
Free e-mail providers such as Yahoo and Hotmail reject messages based on spam reports or a poor IP address reputation. So the more engaged your recipients are with your messages, the better. For example, when your recipients open and read your messages, or pull them out of the spam folder into their inboxes, these are positive indications to the provider that the messages are legitimate.
There are several additional things you can do to improve the chances that your e-mail messages are delivered successfully to recipients who use free e-mail providers:
If you are using a dynamic IP address, this may happen because a previous user of your IP address had a compromised computer that was sending spam. As a result, the IP address has been blacklisted. You can try contacting your ISP and have them issue you a new IP address, or you can just use your ISP's SMTP servers to send e-mail. (You would continue to use A2 Hosting's servers for incoming mail.)
If you have a static IP address, and absolutely must use A2 Hosting servers for outgoing SMTP mail, you must follow the instructions from the blocking organization to remove yourself from their blacklist. Before you do this, you should make sure that none of your computers are infected with a virus or other malware.
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