{"id":4156,"date":"2026-06-08T18:00:47","date_gmt":"2026-06-08T15:00:47","guid":{"rendered":"https:\/\/support.withsecure.com\/en\/?post_type=support_article&#038;p=4156"},"modified":"2026-06-08T18:00:47","modified_gmt":"2026-06-08T15:00:47","slug":"msg-not-sending-emails-to-external-addresses","status":"publish","type":"support_article","link":"https:\/\/support.withsecure.com\/en\/support-articles\/msg-not-sending-emails-to-external-addresses\/","title":{"rendered":"MSG not sending emails to external addresses"},"content":{"rendered":"<h3>Issue:<\/h3>\n<ul>\n<li>The MSG appliance has stopped sending emails out to external domain addresses<\/li>\n<li>Sending emails to internal domain addresses works without issue<\/li>\n<li>Receiving emails from any sender works normally<\/li>\n<li>Outgoing connector is showing errors about invalid certificates<\/li>\n<\/ul>\n<h3>Resolution:<\/h3>\n<p>The problem might be caused by an invalid or expired certificate on the MSG-appliance<\/p>\n<p>To verify the active certificate:<\/p>\n<ol>\n<li>Log in to the MSG web UI<\/li>\n<li>Select the <b>System<\/b>-tab on the top of the page<\/li>\n<li>Navigate to <b>System-&gt;Certificates-&gt;Services<\/b> using the menu on the left-hand side<\/li>\n<li>Note which certificate is in use for the different services<\/li>\n<li>Navigate to <b>System-&gt;Certificates-&gt;Certificates<\/b><\/li>\n<li>Verify the validity of the certificate(s) that is in use<\/li>\n<\/ol>\n<p>If the wrong certificate is in use, it can be changed on the <b>Services<\/b>-page from step 3. Use the dropdown menus to change the certificate for all services and click <b>Save changes<\/b>.<\/p>\n<p>If the certificate in use has expired, use the <b>Generate Certificate Request<\/b>-button on the <b>Certificates<\/b>-page from step 5 to start the process of adding a new certificate to the MSG-appliance. Use the created certificate request with an acquired certificate from a certificate vendor to make a new certificate for the MSG, then import the new certificate into the appliance using the <b>Import<\/b>-button, also on the <b>Certificates<\/b>-page from step 5. After this, use the instructions mentioned above to change the active certificate for all services, and save the changes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The MSG appliance has stopped sending mails out to external recipients<br \/>Sending to internal addresses works without issue<br \/>Receving messages from any sender works normally<br \/>Outgoing connector is showing errors about invalid certificiates<\/p>\n","protected":false},"template":"","support_article_product":[106],"class_list":["post-4156","support_article","type-support_article","status-publish","hentry"],"acf":{"source_foreign_id":"000005628","source_version":3,"source_system":"salesforce","source_date_updated":"2026-06-08 15:00:47","import_hash":"ca5405807479293f6080c70986c3905feaf7f06f","vanilla_article_id":31170,"vanilla_url":"https:\/\/community.withsecure.com\/en\/kb\/articles\/31170-msg-not-sending-emails-to-external-addresses","vanilla_kb_id":30,"vanilla_category_id":103,"machine_translated":false,"reactions_helpful_yes":0,"reactions_helpful_no":0},"_links":{"self":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/support_article\/4156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/support_article"}],"about":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/types\/support_article"}],"wp:attachment":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/media?parent=4156"}],"wp:term":[{"taxonomy":"support_article_product","embeddable":true,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/support_article_product?post=4156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}