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501 Syntax error - Badly formatted address
Technical Articles ID:   KB79975
Last Modified:  2/25/2016
Rated:


Environment

McAfee Email Gateway 7.x

Problem

Emails are rejected with the error code:
 501 Syntax error - Badly formatted address
 
Emails to and from valid email addresses are not sent, and an error message is logged stating that the address is badly formatted.

Cause

This issue is caused one or both of the following:
  • The length of the local part of the email has exceeded what is defined on the appliance.
    NOTE:  MEG 7.x has a predefined maximum length of 64 for the local part of an email address.
     
  • The domain part of the address includes non-RFC characters. This will be true for either the sending or receiving address.
     

Solution

Change the maximum local part length setting for email addresses:
  1. Open the McAfee Appliance Manager.
  2. Browse to EmailEmail ConfigurationProtocol ConfigurationProtocol Settings (SMTP)Address parsing options.
  3. Expand the section. The value in Maximum Length of local part should display 64.
  4. Change this value to 128. This allows local part lengths that are less than 128.
  5. Apply the changes.

Solution

Allow the appliance to process messages that contain non-RFC characters in the domain part of the address:
  1. Open the McAfee Appliance Manager.
  2. Browse to EmailEmail ConfigurationProtocol ConfigurationProtocol Settings (SMTP)Address parsing options.
  3. Expand the section. Select Allow non RFC characters in the domain part.
  4. Apply the changes.

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