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Additional Email Settings Information
Last Updated: Mon, 01 Aug 2016 > Related Articles
Learn about third party SMTP servers, virtual domains, Port 25 restrictions, and view FAQs.
Cox requires all email messages sent from its network to go through Cox outbound email servers. Outbound email servers are known by the acronym SMTP. Any attempt to send email using a third party outbound email server results in an error message and an undelivered message.
Using 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 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 Internet service providers (ISPs) refusing to receive any email, including legitimate messages, from our network.
You may be connecting to a third party email server for one of the following reasons.
- Your email software, such as Outlook Express, is configured to use a third party outgoing email servers to send email, with or without your knowledge.
- Your computer may be allowing other Internet users to connect to it. These outside users may be using your machine to relay their email. We recommend that you review your PC security.
- Your computer may be infected with a virus 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 acquire them through third parties and want to use them in their email messaging. Cox doesn't prevent using vanity domains, in either the From or Reply-To addresses, as part of your email header. However, if you use a vanity domain on your email, it must be a valid domain that can be resolved by 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 route 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 amount of spam and virus email originating from our customers. Most ISPs have adopted this practice to reduce spam. We must take this action to ensure that a few bulk email senders do not get the entire cox.net domain blacklisted from sending mail to other ISPs.
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.cox.net to send outbound email. Please note 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 using Cox High Speed Internet WebMail, or other services such as Gmail or Yahoo mail, as you currently do.
No. This doesn't affect the retrieval of inbound email from any service.
This is just one step in efforts to reduce spam across the Internet. For more information, refer to Spam Resource Center.
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 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.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.
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.