Help Center

Fixing the 550 5.7.1 [PDSTF] error

If you're receiving this error, it means we have detected abuse originating from your email account. It is likely that your account is compromised or forwarding spam or attack email at a very fast rate. It also means that the receivers do not like the content of the mail that is being received and are rejecting them.

How can I unblock my account as an end user? 

Here are some steps you can take to clean up the email coming from your account:

    1. Secure your account against compromise by spammers:
      • Change your password. Ensure your new password has a minimum length of eight characters and uses a mixture of upper and lower case letters, numbers, and special characters.
      • Verify that your operating system is running with the latest security updates.
      • Update your anti-virus software and conduct a full scan of your system to ensure that a spammer has not installed spam-sending malware on your computer.
    2. If you have recently sent a newsletter or other type of mass mailing from your account, verify that none of the URLs within your messages have been flagged by anti-spam systems. Use the Trusted Source URL check to check a URL or domain's reputation. Generally speaking, make sure you are following best practices when sending a bulk campaign, such as using an opt-in only mailing list.
    3. Sanitize your mailing list and ensure you are sending mails to only receivers who have opted in to receive your mail.

If these steps do not resolve the problem, please file a support request with your web hosting provider.  

How can I unblock an end user account as a service provider?

As a first step, verify that the account that is blocked is not compromised and is not sending spam. If the account is compromised, the account has to be secured.

It is quite likely that an account is receiving & forwarding spam. In this cases, you want want to identify the IP from which the mails are originating and block the IP on the inbound side.

If this is a false positive, please raise a support ticket by writing to support@mailchannels.com with the following details

1) Sender email address

2) Subject

3) Recipient email address

 4) Date & Time 

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