Replace mailinator with blackhole

Deliverability is not important in any of these tests, so it should be
safer and more reliable to use blackhole@mailpoet.com instead of the old
 mailinator address, which was used before the blackhole@mailpoet.com
 address existed.

[MAILPOET-4064]

mailpoet/tests/integration/Mailer/Methods/AmazonSESTest.php

@@ -53,7 +53,7 @@ class AmazonSESTest extends \MailPoetTest {
       $this->returnPath,
       new AmazonSESMapper()
     );
-    $this->subscriber = 'Recipient <mailpoet-phoenix-test@mailinator.com>';
+    $this->subscriber = 'Recipient <blackhole@mailpoet.com>';
     $this->newsletter = [
       'subject' => 'testing AmazonSES … © & ěščřžýáíéůėꀿąß∂ 😊👨‍👩‍👧‍👧', // try some special chars
       'body' => [
@@ -122,7 +122,7 @@ class AmazonSESTest extends \MailPoetTest {
     $message = $this->mailer
       ->createMessage($this->newsletter, $this->subscriber, $this->extraParams);
     expect($message->getTo())
-      ->equals(['mailpoet-phoenix-test@mailinator.com' => 'Recipient']);
+      ->equals(['blackhole@mailpoet.com' => 'Recipient']);
     expect($message->getFrom())
       ->equals([$this->sender['from_email'] => $this->sender['from_name']]);
     expect($message->getSender())

mailpoet/tests/integration/Mailer/Methods/MailPoetAPITest.php

@@ -47,7 +47,7 @@ class MailPoetAPITest extends \MailPoetTest {
       new MailPoetMapper(),
       $this->makeEmpty(AuthorizedEmailsController::class)
     );
-    $this->subscriber = 'Recipient <mailpoet-phoenix-test@mailinator.com>';
+    $this->subscriber = 'Recipient <blackhole@mailpoet.com>';
     $this->newsletter = [
       'subject' => 'testing MailPoet … © & ěščřžýáíéůėꀿąß∂ 😊👨‍👩‍👧‍👧', // try some special chars
       'body' => [

mailpoet/tests/integration/Mailer/Methods/PHPMailTest.php

@@ -37,7 +37,7 @@ class PHPMailTest extends \MailPoetTest {
       $this->returnPath,
       new PHPMailMapper()
     );
-    $this->subscriber = 'Recipient <mailpoet-phoenix-test@mailinator.com>';
+    $this->subscriber = 'Recipient <blackhole@mailpoet.com>';
     $this->newsletter = [
       'subject' => 'testing local method (PHP mail) … © & ěščřžýáíéůėꀿąß∂ 😊👨‍👩‍👧‍👧', // try some special chars
       'body' => [
@@ -75,13 +75,13 @@ class PHPMailTest extends \MailPoetTest {
     expect($mailer->getToAddresses())->equals(
       [
         [
-          'mailpoet-phoenix-test@mailinator.com',
+          'blackhole@mailpoet.com',
           'Recipient',
         ],
       ]
     );
     expect($mailer->getAllRecipientAddresses())
-      ->equals(['mailpoet-phoenix-test@mailinator.com' => true]);
+      ->equals(['blackhole@mailpoet.com' => true]);
     expect($mailer->From)->equals($this->sender['from_email']); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
     expect($mailer->FromName)->equals($this->sender['from_name']); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
     expect($mailer->getReplyToAddresses())->equals(

mailpoet/tests/integration/Mailer/Methods/SMTPTest.php

@@ -60,7 +60,7 @@ class SMTPTest extends \MailPoetTest {
       $this->settings['login'],
       $this->settings['password']
     );
-    $this->subscriber = 'Recipient <mailpoet-phoenix-test@mailinator.com>';
+    $this->subscriber = 'Recipient <blackhole@mailpoet.com>';
     $this->newsletter = [
       'subject' => 'testing SMTP … © & ěščřžýáíéůėꀿąß∂ 😊👨‍👩‍👧‍👧', // try some special chars
       'body' => [
@@ -107,7 +107,7 @@ class SMTPTest extends \MailPoetTest {
     $message = $this->mailer
       ->createMessage($this->newsletter, $this->subscriber, $this->extraParams);
     expect($message->getTo())
-      ->equals(['mailpoet-phoenix-test@mailinator.com' => 'Recipient']);
+      ->equals(['blackhole@mailpoet.com' => 'Recipient']);
     expect($message->getFrom())
       ->equals([$this->sender['from_email'] => $this->sender['from_name']]);
     expect($message->getSender())

mailpoet/tests/integration/Mailer/Methods/SendGridTest.php

@@ -42,7 +42,7 @@ class SendGridTest extends \MailPoetTest {
       $this->replyTo,
       new SendGridMapper()
     );
-    $this->subscriber = 'Recipient <mailpoet-phoenix-test@mailinator.com>';
+    $this->subscriber = 'Recipient <blackhole@mailpoet.com>';
     $this->newsletter = [
       'subject' => 'testing SendGrid … © & ěščřžýáíéůėꀿąß∂ 😊👨‍👩‍👧‍👧', // try some special chars
       'body' => [