diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 09e816a8f..c97f7195a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -97,7 +97,7 @@ jobs:
       uses: shivammathur/setup-php@master
       with:
           php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, imap, bcmath, redis, memcached
+          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, bcmath, redis, memcached
           ini-values: opcache.jit_buffer_size=256M, opcache.jit=1235, pcre.jit=1
           coverage: pcov
     - name: Get Composer Cache Directory
@@ -137,7 +137,7 @@ jobs:
       uses: shivammathur/setup-php@master
       with:
           php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, imap, bcmath, redis, memcached
+          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, bcmath, redis, memcached
           ini-values: opcache.jit_buffer_size=256M, opcache.jit=1235, pcre.jit=1
     - name: Get Composer Cache Directory
       id: composer-cache
@@ -179,7 +179,7 @@ jobs:
       uses: shivammathur/setup-php@master
       with:
           php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, imap, bcmath, redis, memcached
+          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, bcmath, redis, memcached
           ini-values: opcache.jit_buffer_size=256M, opcache.jit=1235, pcre.jit=1
     - name: Get Composer Cache Directory
       id: composer-cache
@@ -239,7 +239,7 @@ jobs:
       uses: shivammathur/setup-php@master
       with:
           php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, imap, bcmath, redis, memcached
+          extensions: mbstring, gd, zip, dom, mysql, pgsql, sqlite, bcmath, redis, memcached
           ini-values: opcache.jit_buffer_size=256M, opcache.jit=1235, pcre.jit=1
     - name: PHP linting
       run: |
diff --git a/tests/Message/Mail/ImapTest.php b/tests/Message/Mail/ImapTest.php
index ebdf91d9c..6fa7883ad 100644
--- a/tests/Message/Mail/ImapTest.php
+++ b/tests/Message/Mail/ImapTest.php
@@ -33,6 +33,12 @@ final class ImapTest extends \PHPUnit\Framework\TestCase
      */
     protected function setUp() : void
     {
+        if (!\extension_loaded('imap')) {
+            $this->markTestSkipped(
+              'The imap extension is not available.'
+            );
+        }
+
         $this->handler        = new Imap('testuser', 'testuser', 143);
         $this->handler->host  = '127.0.0.1';
         $this->handler->flags = '/imap/notls/norsh/novalidate-cert';
diff --git a/tests/Message/Mail/Pop3Test.php b/tests/Message/Mail/Pop3Test.php
index 0b1c66f28..d42ca66de 100644
--- a/tests/Message/Mail/Pop3Test.php
+++ b/tests/Message/Mail/Pop3Test.php
@@ -33,6 +33,12 @@ final class Pop3Test extends \PHPUnit\Framework\TestCase
      */
     protected function setUp() : void
     {
+        if (!\extension_loaded('imap')) {
+            $this->markTestSkipped(
+              'The imap extension is not available.'
+            );
+        }
+
         $this->handler        = new Pop3('testuser', 'testuser', 110);
         $this->handler->host  = '127.0.0.1';
         $this->handler->flags = '/pop3/notls';