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Technical Standards for Email Delivery
- KWRI’s mail systems will not accept mail from mail systems and/or network ranges known or suspected to be involved in the dissemination of unsolicited commercial or bulk email.
- KWRI’s mail systems will not accept connections from unsecured systems. This includes open relays, open proxies, open routers, or have otherwise been determined to be susceptible to unauthorized use.
- KWRI’s mail systems will not accept direct connections from any systems that reside within residential or dynamically assigned IP ranges. Please use your ISP’s mail systems or a smart forwarder for your MTA if this affects you.
- KWRI’s mail systems will not accept email that contains a hex-encoded Universal Resource Locator (URL). (Ex: http://%6d%6e%3f/)
- KWRI’s mail systems will not accept email that contains URLs that utilize bare IP literals. (Ex., http://127.0.0.1/example.html)
- KWRI’s mail systems will not accept email containing URLs that are listed in SURBL services.
- KWRI’s mail systems will not accept email containing URLs which have been advertised through unsolicited commercial and/or bulk email.
- KWRI’s mail systems will not accept mail that contains executable content in any form. This includes scripting tags within the content of emails, or attached files of an executable nature, or compressed archives with executable files contained within (this does not include attached archives containing html files that include scripting).
- KWRI’s mail systems will not accept email from envelope senders whose domain does not have an MX record associated with that domain, or when the MX systems from said domain refuse to accept email, or are configured in such a way so as to prevent bounce-returns from being processed.
- KWRI’s mail systems may reject connections from IP addresses that do not have an rPTR record.
- KWRI’s mail systems may reject connections from mail systems that do not use a valid Fully Qualified Domain Name (FQDN) as their HELO/EHLO declaration.
- KWRI’s mail systems will not accept connections from mail systems that use an IP address literal for their HELO/EHLO declarations (ex: [66.45.126.185]).
- KWRI’s mail systems may reject connections from hosts on IP addresses that do not reverse resolve. Delisting for such hosts is not available until this is corrected.
- Complaints from KWRI’s userbase will be used as a basis for refusing connections from mail systems or network ranges.
- KWRI’s mail systems will not accept mail using a null envelope sender with multiple recipients. This violates RFC2821 and is considered an invalid use of the null envelope sender.
- KWRI’s mail systems may reject mail or connections from mail systems that do not conform with RFC2821 specifying the SMTP protocol (See http://www.faqs.org/rfcs/rfc2821.html for details).
- KWRI’s mail systems may reject connections from mail systems that do not reside in IP ranges located outside of North America or Western Europe. Whitelisting for non-domestic hosts may be necessary, and not all hosts will qualify. Please contact postmaster@kw.com with the IP information of any overseas hosts for whitelisting consideration. KWRI reserves the right to refuse any whitelisting request based on our discretion.
- KWRI reserves the right to deny email from any Internet host based entirely on our discretion.
Appeals pertaining to delisting blocked hosts should be directed to postmaster@kw.com. All submissions must include IP information for any hosts experiencing rejected mail, as well as the contents of any rejection notices, log entries, or other relevant information that will help us diagnose the source of origin and cause of these blocked mails.
Submissions to postmaster that do not include this information, or requests by end users for assistance submitted to postmaster may be discarded without notification: postmaster is intended as a means of facilitating communication between systems administrators. Any and all submissions for blocked hosts must be submitted by representatives of the organization(s) administering the systems under block, as configuration, policy, or other changes may be required in order to delist. If you are using a mail system that is unable to email kw.com recipients, please direct your email or network administrator to contact us at postmaster@kw.com.
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