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Additional Email Settings Information
Last Updated: Fri, 07 Mar 2014 > Related Articles
Learn to use third party SMTP servers, virtual domains, Port 25 restrictions and FAQs.
Cox requires all email messages sent from its network to go through Cox outbound servers. Outbound mail is known by the acronym, SMTP. Any attempt to send email using a 3rd party outbound email server will result in an error message, and the message will not be delivered.
The use of Cox email servers is required to reduce the amount of unsolicited email, or spam, that is sent from the Cox network. Spam is not only a nuisance, but it can degrade the email service by consuming network and server resources. Spam also increases the potential for computer virus attacks. Finally, excessive amounts of spam originating from our network can result in other ISPs refusing to receive any email, including legitimate messages, from our network.
You may be connecting to a 3rd party mail server for one of the following reasons:
- Your email software, such as Outlook Express, is configured to use a 3rd party outgoing mail server to send email, with or without your knowledge.
- Your computer may be allowing other users from the Internet to connect to it. These outside users may be using your machine to relay their email. We recommend that you review the security of your PC.
- Your computer is infected with a virus that is attempting to spread itself through email. We recommend that you update your anti-virus software and scan your machine for viruses.
Although Cox does not currently host or support vanity domains, some customers have acquired them through 3rd parties and want to use them in their email messages. Cox does not prevent the use of vanity domains, in either the From or Reply-To address in your email header. However, if you use a vanity domain on your email, it must be a valid domain that can be resolved by the Domain Name System (DNS) servers. Any email sent with invalid domains in the From or Reply-To address fields will not be delivered.
No. You can use any valid email address, but the email sent from your Cox High Speed Internet connection must be routed through a Cox SMTP server.
For more information on setting up your email, refer to Resources for Setting Up Cox.net Email.
It reduces the number of spam and virus emails originating from our customers. Most Internet Service Providers have adopted this practice to reduce spam. We must take this action to ensure that a few bulk emailers do not get the entire cox.net domain blacklisted from sending mail to other Internet Service Providers.
This will not impact the majority of customers, but there are bound to be some people using 3rd party mail servers. Any software configured to use an SMTP server other than smtp.region.cox.net to deliver email directly to a recipient's server will no longer work. An indication of this problem may be a message similar to the following in your mail client:
A time-out occurred while communicating with the server. Account: otheraccount.otherisp.com, Server: othersmtp.otherisp.com, Protocol: SMTP, Port 25, Secure(SSL): No, Error Number: 0x800CCC19.
Customers using third party email services must configure their email clients to use smtp.region.cox.net to send outbound email. Please remember that operating an email or other server on a residential Cox High Speed Internet connection is a violation of our Acceptable Use Policy.
No. You can continue to use Cox High Speed Internet WebMail, or services like HotMail and Yahoo mail as you currently do.
No. This will not affect retrieval of inbound email from any service.
This is just one step in efforts to reduce spam across the Internet. For more information, go to Adware / Spyware Information.
We understand that some customers have vanity domain names, and this action should not keep you from using your personal domain name. To ensure your ability to send email from your personal domain, your mail client must be set to a Cox outgoing mail server otherwise known as an SMTP. This change in settings will be transparent to email recipients, and will not impact your ability to receive email. If you have a business requirement to bypass the Cox mail servers, please contact Cox Business Services for additional options.
Customers must configure their email clients to use smtp.[region].cox.net to send outbound email. Operating an email or other server on a residential Cox High Speed Internet connection is a violation of our Acceptable Use Policy.
As part of our spam prevention procedures, we test the domain name in the From address in each message to be sure that it is valid. If the Domain Name Service does not show that the domain name has a valid mail server, those server connections are rejected. The customer will receive a message in Outlook Express that begins: The message could not be sent because the server rejected the sender's email address. The sender's email address was ...
Customers should use their Cox.net email address or any other valid address in the From field.