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Emails from or to addresses with a leading dash (-) in the address are rejected

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Article ID: 240615

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Updated On:

Products

Messaging Gateway

Issue/Introduction

Messaging Gateway (SMG) Message Audit Logs (MAL) show messages from senders with a leading dash in the email address are rejected:

  • SMG rejects email messages from senders with a leading dash in the user part of the email address
    mail from: [email protected]
    501 5.1.7 MAIL FROM: -user syntax error (minus sign -) not allowed
    Connection closed by foreign host.
  • SMG rejects recipients which have a leading dash in the user part of the email address
    mail from: [email protected]
    250 2.0.0 MAIL FROM accepted
    rcpt to: [email protected]
    501 5.1.3 RCPT TO: -user syntax error (minus sign -) not allowed

Cause

In its default configuration, SMG does not accept a leading dash in the user part of email addresses. 

Resolution

This can be addressed by explicitly allowing email addresses with a leading dash character

  1. Log into the SMG Control Center as an admin 
  2. Go to Protocols > Settings
  3. Enable Allow email addresses to start with a dash
  4. Click `Save`

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