Message is getting blocked by MSG maxsize firewall rule despite being seemingly smaller than the limit - F-Secure Community
<main> <article class="userContent"> <h3 data-version="2" data-article="000001618">Issue:</h3> <p>Emails are blocked by the Messaging Security Gateway (MSG) or Protection Service for Email (PSE) <i>maxsize </i>firewall rule despite being seemingly smaller than the limit.</p> <h3>Resolution:</h3> <p></p><p>The <i>maxsize</i> firewall rule may include multiple criteria. Most likely one of the other criteria are being met by the message. Here is an example of the <i>maxsize </i>firewall rule criteria:</p> <p>Message size greater than 52428800 Bytes<br>OR Attachment count greater than 256<br>OR Total Uncompressed Attachment size greater than 52428800 Bytes<br>OR File count in archive greater than 256<br>OR File depth in archive greater than 20<br><br>To check and modify the rule used in your appliance:</p> <ol><li>Log in to the MSG Web UI</li><li>Select the <b>Email Protection</b>-tab</li><li>Navigate to <b>Email Firewall -> Rules</b> using the left-side menu</li><li>Locate the rule called <i>maxsize</i> from the list of rules</li></ol><ul><li>The settings of the rule can be checked directly from the list</li><li>To modify the rule, click on <b>Edit Rule</b>, make the necessary changes and click <b>Save changes</b></li></ul><p>Article no: 000001618</p> </article> </main>