SMTP connect() failed

I just discovered we had this issue yesterday. Successfully setup mailgun this morning. It’s free for less than 10,000 emails per month.

WordPress SMTP EMail

Replace the line mail (“{$ad[‘display_name’]} <$email>”, $subject, $html, $headers); with wp_mail(“{$ad[‘display_name’]} <$email>”, $subject, $html, $headers); and install the WP_Mail_SMTP plugin which will use SMTP instead of the php mail() function.

SMTP Issues with Office 365

Your goal is to send emails, using that specific plugin isn’t a requirement. Therefore, I suggest you install and activate instead the WP Mail SMTP plugin. Once it’s active, go to Settings > WP Mail SMTP to configure the plugin settings. This will ask you to enter the email address and a from name (similar … Read more

Are email addresses case sensitive?

From RFC 5321, section 2.3.11: The standard mailbox naming convention is defined to be “local-part@domain”; contemporary usage permits a much broader set of applications than simple “user names”. Consequently, and due to a long history of problems when intermediate hosts have attempted to optimize transport by modifying them, the local-part MUST be interpreted and assigned … Read more