ME020241 - PRB: Messages sent to remote servers appear in the Junk Mail folder


SYMPTOM

Messages sent to remote server from a MailEnable server appear in the recipients Junk Mail folder. This is happening for messages sent to domains such as Gmail, Outlook.com, Yahoo, etc. 

CAUSES

There are various possibilities as to why messages can be considered as junk by remote servers and therefore delivered to a users junk email folder. Unfortunately most service providers provide no details as to why they do this, in order to prevent spammers from working around any checks they do. But some of major reasons why emails are junked are:

  • No PTR record
  • Connecting from a dynamically assigned IP, or a connection classed as a cable/ADSL connection 
  • Incorrect sender address
  • Invalid/misleading subject line
  • No SPF record for the domain
  • No DKIM for the sending domain
  • Content of the message, such as lots of HTML, images, etc.
  • The message is being auto-generated by a script or program
  • The sending IP address has a poor reputation
  • The sending IP address has sent junk email in the past, or users have marked messages from the sending IP as junk before

 

PREVENTING MESSAGES BEING DELIVERED TO JUNK FOLDER


Product: MailEnable
Version: All Versions
Category:
Module: SMTP
Keywords: PTR Hotmail outlook.com gmail yahoo Junk mail spam junk spam
Class: PRB: Product Problem or Issue
Created:
Revision Date:Sat, 3 Jan 2004 21:02:03 -0500