Error : Dictionary Attack


Dictionary Attack

A method often used by spammers. They send various emails or passwords to a domain hoping that one will succeed.

The server detects a dictionary attack when a user attempts to send email to four consecutive invalid email addresses. When this happens the server believes it is getting spammed by someone who is trying a bunch of addresses to see if any of them get through.


The dictionary attack block will be removed after 1 hour if there are no more than 4 erroneous emails in a row.

You must stop sending emails and pause your mailing lists. Then wait approximately 1 hour, and it should clear itself.

If you were using Outlook, during the wait you can try using webmail to send messages.

  • 0 Users Found This Useful
Was this answer helpful?

Also Read

Email Trace

  cPanel's Email Trace icon is intended for troubleshooting email routing issues. With this...

535 Incorrect Authentication Data

  This error is commonly seen with mailbox file permissions in cPanel. Root access is...

451 Error While Writing Spool File

  This message indicates that your email is not configured properly. Please make sure you are...

Invalid maildirsize error

  How to fix the error "invalid maildirsize": Login to your server via FTP or File...

DMARC - Rejection Emails

What is DMARC? DMARC standardizes how email receivers perform email authentication using the...