title: Email problem in Outlook 554 5.2.0 SubmissionQuotaExceededException
body: <p>My system sends emails via PHP to the users on my website, but as of lately none of my mails will send and I will get the following error: </p>
  
  <blockquote>
    <p>554 5.2.0
    STOREDRV.Submission.Exception:SubmissionQuotaExceededException; Failed
    to process message due to a permanent exception with message The
    message can't be submitted because the sender's submission quota was
    exceeded. SubmissionQuotaExceededException: The message can't be
    submitted because the sender's submission quota was exceeded.
    [Hostname=xxx.PROD.OUTLOOK.COM]  Tegengehouden door een
    SMTP-foutmelding: 554 5.2.0
    STOREDRV.Submission.Exception:SubmissionQuotaExceededException; Failed
    to process message due to a permanent exception with message The
    message can't be submitted because the sender's submission quota was
    exceeded. SubmissionQuotaExceededException: The message can't be
    submitted because the sender's submission quota was exceeded.
    [Hostname=xxx.PROD.OUTLOOK.COM]</p>
  </blockquote>
  
  <p>I've been Googling it like there's no tomorrow (i think i've read every page in the first 3 google results pages). And I cannot seem to find a solution to this.</p>
  
  <p>These are the things I checked:</p>
  
  <ol>
  <li>None of the mail boxes are full (the email addresses where we sent the mails via PHP from are respectively 1.9/50GB and 2.6/50GB full).</li>
  <li>I can still send emails manually from both these email addresses when using the outlook web client</li>
  <li>I am not an admin so I cannot run the message tracer to get an exact amount of emails that I am sending <a href="https://docs.microsoft.com/nl-nl/exchange/monitoring/trace-an-email-message/run-a-message-trace-and-view-results" rel="nofollow noreferrer">message tracer</a>. But it definitely is not over 10k per day or 30/minute. </li>
  </ol>
  
  <p>Note: the error is <strong>554 5.2.0 STOREDRV.Submission.Exception:SubmissionQuotaExceededException</strong> . Most of the results on google for the 554 5.2.0 error contain the following error message "STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied", this is <strong>NOT</strong> the case for me. </p>