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Earthlink has 2 SMTP server systems for sending mail. They are described below.
* Open, non-authenticated mail sending for Earthlink customers.
* Accessed only on port 25 (SMTP).
* Protected by IP filtering only (IP-allow). With the many Earthlink partners supplying network connections, this IP-allow often fails.
* World-wide SPAM problem puts pressure on Earthlink to eliminate this server/service and Earthlink has announced it will be phased out.
* IP-allow problems eliminated by using smtpauth.earthlink.net. Unfortunately, this seems to have created a low-priority within Earthlink to fix these IP-allow problems when they occur.
* When experiencing IP-allow problems, it *may* be possible to recycle your IP address and end up with an IP that works. Of course, this is not a reliable work-around.
* Closed mail server for Earthlnk customers. Must be authenticated with Earthlink account (full email address and password). Authentication techniques supported:
* No IP filtering, can be accessed from any network.
* Accessible on both ports 25 and 587. This can help get around blocks on port 25 many networks (including Earthlink) use.
* Performs a check of the "From:" field of all email messages. It appears the domain name must have a valid DNS lookup to send mail.