Work through these in order. Most SMTP problems are a wrong port, a wrong username, or a sender address the provider hasn’t verified.<\/p>\n\n\n\n
Open White Label > Email Configs > SMTP Connectivity<\/strong> and click Test Connection<\/strong>. A working setup returns SMTP Connected<\/strong>. Anything else points to the host, port, encryption or credentials.<\/p>\n\n\n\n To protect your mail account from being locked by the provider, SMTP sending is disabled automatically after five consecutive authentication failures<\/strong>, and a notification email is sent to your registered reseller address. While it is disabled, your users receive no emails at all<\/strong>, including login OTPs and signup codes, so fix it as soon as you see that notice.<\/p>\n\n\n\n To restore it: open the SMTP Connectivity section, correct the credentials, and run Test Connection<\/strong>. A successful test clears the failure count and re-enables sending.<\/p>\n\n\n\n Contact support with the exact error from Test Connection, your SMTP host and port, and the time of a failed send, so the mail logs for your account can be checked.<\/p>\n","protected":false},"excerpt":{"rendered":" Work through these in order. Most SMTP problems are a wrong port, a wrong username, or a sender address the provider hasn’t verified. 1. Run Test Connection Open White Label > Email Configs > SMTP Connectivity and click Test Connection. A working setup returns SMTP Connected. Anything else points to the host, port, encryption or […]<\/p>\n","protected":false},"author":118,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[1620],"doc_tag":[],"class_list":["post-3046","docs","type-docs","status-publish","hentry","doc_category-email-settings"],"year_month":"2026-09","word_count":301,"total_views":"29","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"admin","author_nicename":"admin","author_url":"https:\/\/www.smsgatewaycenter.com\/blog\/author\/admin\/"},"doc_category_info":[{"term_name":"Email Settings","term_url":"https:\/\/www.smsgatewaycenter.com\/blog\/kb-cat\/email-settings\/"}],"doc_tag_info":[],"_links":{"self":[{"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/docs\/3046","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/users\/118"}],"replies":[{"embeddable":true,"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/comments?post=3046"}],"version-history":[{"count":0,"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/docs\/3046\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/media?parent=3046"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/doc_category?post=3046"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/www.smsgatewaycenter.com\/blog\/wp-json\/wp\/v2\/doc_tag?post=3046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}2. Check the usual mistakes<\/h2>\n\n\n\n
Symptom<\/th> Likely cause<\/th><\/tr><\/thead> Connection times out<\/td> Wrong port, or the port is blocked. Try 465 with SSL or 587 with STARTTLS.<\/td><\/tr> Authentication fails<\/td> Wrong password, or a provider that needs an app password rather than the mailbox password. On AWS SES, the username must be the SMTP username starting with AKIA\u2026<\/code>, and the From E-Mail must be a separately verified address.<\/td><\/tr>Authentication still fails with correct details<\/td> Set SMTP Auth Mode<\/strong> to LOGIN or PLAIN instead of Default (automatic).<\/td><\/tr> Test passes but mail never arrives<\/td> The provider is rejecting the sender. Verify the From E-Mail with your provider and add SPF and DKIM records to your domain.<\/td><\/tr> Some emails arrive, bulk sends stop midway<\/td> You are exceeding your provider’s rate limit. Pick a lower SMTP Provider Profile<\/strong>.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n 3. Has your SMTP been switched off automatically?<\/h2>\n\n\n\n
4. Still stuck<\/h2>\n\n\n\n