SMTP and Internet mail toubleshooting

Issues with Internet mail delivery

If your mail is getting rejected:

• Check your mail domain is configured correctly in external DNS at http://www.intodns.com/
• Check that your mail domain has not been blacklisted at http://www.mxtoolbox.com/
• Check that your domain has a PTR record in public DNS
• Check that your domain has an SPF record. Absense of this record will make other mail systems more likely to reject mail or classify it as spam. See http://www.openspf.org/Why for more information or to test SPF.

If mail is getting rejected by hotmail, check http://postmaster.live.com/.

Issues with scanning to email

If you are scanning mail to your inbox but it is not arriving, or other email is not arriving consistently:

• Check if other people are able to receive mail from the scanner
• Find the IP address and name of the scanner, and try to manage it remotely through HTTP or HTTPS
• Check junk email folder. If they are going into junk email, add the scanner "from" address to the safe senders list on the Outlook client.

Issue sending to Exchange 2007 distribution lists from external

If you are sending to a distribution list that is hosted in Exchange and you sending from external, you may receive the following very helpful error messages: -

• Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
• #550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;travnatad@smtpex.toll.com.au

The answer is generally quite simple. An Exchange 2007 distribution list requires senders to be authenticated by default. To disable this, go into the distribution list properties and on the Mail Flow tab, select Message Delivery Restrictions. Uncheck the box that says "Require that all senders are authenticated". Then mail will start to flow.