{"id":27187,"date":"2025-11-21T06:14:56","date_gmt":"2025-11-21T06:14:56","guid":{"rendered":"https:\/\/salemexpress.co.in\/?p=27187"},"modified":"2025-11-21T06:18:23","modified_gmt":"2025-11-21T06:18:23","slug":"why-your-sms-delivery-rate-is-low-how-to-fix-it","status":"publish","type":"post","link":"https:\/\/salemexpress.co.in\/index.php\/2025\/11\/21\/why-your-sms-delivery-rate-is-low-how-to-fix-it\/","title":{"rendered":"Why Your SMS Delivery Rate Is Low & How to Fix It"},"content":{"rendered":"\t\t
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Bulk SMS campaigns are powerful \u2014 but only if your messages actually get delivered. Many businesses struggle with a low SMS delivery rate<\/strong>, which affects customer communication, OTP verification, marketing campaigns, and transactional updates.<\/p>

A poor delivery rate means your messages are getting blocked<\/strong>, filtered<\/strong>, or failing<\/strong> due to technical or regulatory issues. In this guide, you\u2019ll learn the major reasons behind low delivery and practical steps to fix them.<\/p>

What Is SMS Delivery Rate?<\/strong><\/h3>

SMS Delivery Rate = (Delivered Messages \/ Total Messages Sent) \u00d7 100<\/strong><\/p>

A healthy delivery rate is usually 95\u201398%<\/strong>.
Anything below 90%<\/strong> signals a serious problem.<\/p>

Top Reasons Your SMS Delivery Rate Is Low<\/strong><\/h3>

1. DLT Failures (India-Specific Issue)<\/strong><\/h2>

Since DLT is mandatory, even small issues can block your SMS completely.<\/p>

Common DLT Issues<\/strong><\/h3>

  • Wrong or inactive sender ID<\/strong><\/p><\/li>

  • Unapproved SMS templates<\/strong><\/p><\/li>

  • Incorrect template header & body mapping<\/strong><\/p><\/li>

  • Missing variables or mismatched characters<\/p><\/li><\/ul>

    Fix<\/strong><\/h3>

    • Ensure all templates are approved<\/p><\/li>

    • Map sender ID & template correctly<\/p><\/li>

    • Use exact template text (even punctuation matters)<\/p><\/li><\/ul>

      2. Poor Sender ID Configuration<\/strong><\/h2>

      If your sender ID is invalid, expired, or not registered, telecom operators automatically block messages.<\/p>

      Fix<\/strong><\/h3>

      • Register sender ID properly on DLT<\/p><\/li>

      • Use fixed & verified sender IDs<\/p><\/li>

      • Avoid changing sender ID frequently<\/p><\/li><\/ul>

        3. Sending SMS to Non-Active or Switch-Off Numbers<\/strong><\/h2>

        Mobile numbers that are:<\/p>

        • Switched off<\/p><\/li>

        • Out of network<\/p><\/li>

        • Invalid<\/p><\/li>

        • Ported recently<\/p><\/li><\/ul>

          \u2026will cause delivery failures.<\/p>

          Fix<\/strong><\/h3>

          • Clean your database regularly<\/p><\/li>

          • Remove inactive or unreachable numbers<\/p><\/li>

          • Use HLR (Home Location Register) lookup tools<\/p><\/li><\/ul>

            4. Network Congestion or Operator Filters<\/strong><\/h2>

            Telecom operators may block or delay messages during:<\/p>

            • Festivals<\/p><\/li>

            • Peak hours<\/p><\/li>

            • System maintenance<\/p><\/li>

            • Congested network zones<\/p><\/li><\/ul>

              Fix<\/strong><\/h3>

              • Schedule SMS during low-traffic hours<\/p><\/li>

              • Split bulk campaigns into batches<\/p><\/li>

              • Use multi-operator routing<\/p><\/li><\/ul>

                5. Content Violations (Filtered by Operators)<\/strong><\/h2>

                Certain words or content styles trigger spam filters.<\/p>

                Blocked Examples<\/strong><\/h3>

                • Excessive caps<\/p><\/li>

                • Adult terms<\/p><\/li>

                • High-frequency promotional words<\/p><\/li>

                • Scam-like keywords<\/p><\/li><\/ul>

                  Fix<\/strong><\/h3>

                  • Use clean, professional content<\/p><\/li>

                  • Avoid sensitive keywords<\/p><\/li>

                  • Keep SMS short & compliant<\/p><\/li><\/ul>

                    6. Overuse of URL Shorteners<\/strong><\/h2>

                    Spam filters often block SMS that contain unknown or suspicious shortened links.<\/p>

                    Fix<\/strong><\/h3>

                    • Use branded URLs or your domain<\/p><\/li>

                    • Avoid free shorteners like bit.ly for bulk campaigns<\/p><\/li><\/ul>

                      7. Sending Messages to DND (Do Not Disturb) Numbers<\/strong><\/h2>

                      Promotional SMS cannot<\/strong> be delivered to DND-registered users.<\/p>

                      Fix<\/strong><\/h3>

                      • Switch to transactional<\/strong> route for important alerts<\/p><\/li>

                      • Use WhatsApp for promotional communication<\/p><\/li><\/ul>

                        8. Low-Quality SMS Gateway Provider<\/strong><\/h2>

                        Cheap SMS services often use poor routing which lowers delivery rate.<\/p>

                        Fix<\/strong><\/h3>

                        • Choose a reliable provider with:
                          \u2714 Direct operator routes
                          \u2714 DLR (Delivery Report) accuracy
                          \u2714 High throughput
                          \u2714 Redundant routing<\/p><\/li><\/ul>

                          Common SMS Delivery Issues & Fixes (Table)<\/strong><\/h3>
                          Issue<\/strong><\/th>Reason<\/strong><\/th>Fix<\/strong><\/th><\/tr><\/thead>
                          Low delivery rate<\/td>DLT template mismatch<\/td>Re-verify approved templates<\/td><\/tr>
                          Messages failing<\/td>Incorrect sender ID<\/td>Register\/activate proper sender ID<\/td><\/tr>
                          Delivery delay<\/td>Network congestion<\/td>Schedule SMS in batches<\/td><\/tr>
                          High failure in promotions<\/td>DND numbers<\/td>Use WhatsApp or transactional route<\/td><\/tr>
                          Click rate low<\/td>Blocked URLs<\/td>Use branded tracking links<\/td><\/tr><\/tbody><\/table><\/div><\/div>

                          How to Improve Your SMS Delivery Rate (Checklist)<\/strong><\/h3>

                          \u2714 Use DLT-approved templates<\/h4>

                          \u2714 Clean your phone number database monthly<\/h4>

                          \u2714 Avoid spam words<\/h4>

                          \u2714 Use branded links instead of free shorteners<\/h4>

                          \u2714 Choose a high-quality bulk SMS provider<\/h4>

                          \u2714 Personalize the message for higher engagement<\/h4>

                          \u2714 Send messages during optimal times<\/h4>

                          \u2714 Use real-time delivery tracking reports (DLR)<\/h4>

                          Ideal SMS Delivery Benchmarks<\/strong><\/h3>
                          SMS Type<\/strong><\/th>Expected Delivery Rate<\/strong><\/th><\/tr><\/thead>
                          OTP \/ Transactional<\/td>98\u2013100%<\/td><\/tr>
                          Promotional<\/td>90\u201395%<\/td><\/tr>
                          Regional \/ Unicode<\/td>92\u201397%<\/td><\/tr>
                          Long SMS ( > 160 chars )<\/td>Lower due to split messages<\/td><\/tr><\/tbody><\/table><\/div><\/div>

                          Conclusion<\/strong><\/h3>

                          Low SMS delivery rate affects everything \u2014 lead generation, OTP verification, customer support, payments, and conversions. By fixing DLT issues, improving content quality, using verified sender IDs, and choosing a reliable SMS provider, you can achieve 95\u201398% delivery consistently<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                          Bulk SMS campaigns are powerful \u2014 but only if your messages actually get delivered. Many businesses struggle with a low SMS delivery rate, which affects customer communication, OTP verification, marketing campaigns, and transactional updates. A poor delivery rate means your messages are getting blocked, filtered, or failing due to technical or regulatory issues. In this […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-27187","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/posts\/27187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/comments?post=27187"}],"version-history":[{"count":4,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/posts\/27187\/revisions"}],"predecessor-version":[{"id":27191,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/posts\/27187\/revisions\/27191"}],"wp:attachment":[{"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/media?parent=27187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/categories?post=27187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/salemexpress.co.in\/index.php\/wp-json\/wp\/v2\/tags?post=27187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}