diff --git a/addons/mail/static/src/core/common/composer.xml b/addons/mail/static/src/core/common/composer.xml
index 2a5d7f04037..caa54115d80 100644
--- a/addons/mail/static/src/core/common/composer.xml
+++ b/addons/mail/static/src/core/common/composer.xml
@@ -104,7 +104,7 @@
 
 <t t-name="mail.Composer.sendButton" owl="1">
     <button t-if="!compact or ui.isSmall" class="o-mail-Composer-send btn o-last border-start-0"
-        t-att-class="{'btn-primary': extended, 'rounded-0 rounded-end-3': !extended and !compact, 'btn-link align-self-stretch': !extended, 'border-start-0': env.inDiscussApp}"
+        t-att-class="{'btn-primary': extended, 'rounded-0 rounded-end-3': !extended and !compact, 'btn-link align-self-stretch': !extended, 'border-start-0 ms-2 me-3': env.inDiscussApp}"
         t-on-click="sendMessage"
         t-att-disabled="isSendButtonDisabled"
         t-att-aria-label="SEND_TEXT"