SMTP Mailer


SMTP Mailer plugin allows you to configure a mail server which handles all outgoing email from your website. It takes control of the wp_mail function and use SMTP instead.


SMTP Mailer instellingen

  • SMTP Host: Your outgoing mail server (e.g.
  • SMTP Authentication: Whether to use SMTP authentication when sending an email (True/False). If you choose to authenticate you will also need to provide your username and password.
  • SMTP Username: The username to connect to your SMTP server.
  • SMTP Password: The password to connect to your SMTP server.
  • Type of Encryption: The encryption to be used when sending an email (TLS/SSL/No Encryption. TLS is recommended).
  • SMTP Port: The port to be used when sending an email (587/465/25). If you choose TLS the port should be set to 587. For SSL use port 465 instead.
  • From Email Address: The email address to be used as the From Address when sending an email.
  • From Name: The name to be used as the From Name when sending an email.

SMTP Mailer Test Email

Once you have configured the settings you can send a test email to check the functionality of the plugin.

  • To: Email address of the recipient.
  • Subject: Subject of the email.
  • Message: Email body.

Known Compatibility

SMTP Mailer should work with any plugin that uses the WordPress Mail function. However, It has been tested with the following form and contact form plugins:

  • Contact Form 7
  • Jetpack Contact Form
  • Visuele Formulier Bouwer
  • Fast Secure Contact Form
  • Formidable Forms
  • Contact Form door BestWebSoft

For detailed setup instructions please visit the SMTP Mailer plugin page.


  • SMTP Mailer instellingen
  • SMTP Mailer Test Email Tab


  1. Go to the Add New plugins screen in your WordPress Dashboard
  2. Click the upload tab
  3. Browse for the plugin file ( on your computer
  4. Klik “Installeer nu” en klik dan op de activeer knop.


Kan ik e-mail via SMTP versturen vanaf mijn website met deze plugin?



januari 27, 2019
this addition has a bug or security weakness i added to 3 site different time. and this 3 site was hacked. either smtp mailer has a bug or this user did this. i dont know but i dont like.
juli 10, 2018
Simple, does the trick... Works well I'm using it to connect to sending emails via Gmail/g-suite
oktober 9, 2017
This is the only plugin that allows me website to send via SMTP... my only request would be to put out an update to remove the error message when the port is left blank. I found an obscure post on a forum about a guy troubleshooting the issue... apparently with 1and1 if your website is hosted with them and you are also trying to send email via SMTP through them, you need to select to use no authentication and leave the port blank with the server "". This apparently is the only way to route the emails correctly. I've been battling trying to get this to function for about 4 hours until now... thanks for allowing the port to be left blank in your plugin!
oktober 7, 2017
I was able to use the information in the trouble shoot page to make goDaddy SMTP server to work. Works like a charm, thank you.
juli 27, 2017
I have been wanting to bypass HostGator's SMTP for some time and use Zoho. I thought this plugin would be perfect for my needs, but the test email hung, and the SMTP server query still brought up HostGator's servers instead of Zoho. Rather than go without email altogether as things are troubleshooted, it was better to just remove the plugin. There are many good reviews, so for many, it apparently works well--that was the reason I downloaded it and installed it. But it did not do the job for me, so I have to give it 1 star.
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  • SMTP Mailer now checks for a valid nonce when sending a test email.


  • SMTP Mailer no longer shows the saved password in the settings.


  • SMTP Mailer is now compatible with WordPress 4.9.


  • Updated the mail() function by setting its minimum requirements to WordPress 4.8.
  • “phpmailer_init” action hook is now enabled so it can be used by other plugins.


  • Fixed a bug where an apostrophe in the password would cause SMTP authentication failure.


  • SMTP Mailer now supports the “wp_mail_failed” hook which fires after a phpmailerException is caught.
  • Added a new option to bypass this error on some servers where the SSL certificate is not properly configured – Warning: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed.


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