Overview The ‘Gmail could not authenticate’ SMTP error often occurs when trying to send emails through Gmail’s API on your website. It indicates that the SMTP server is unable to verify your connection. In WP Mail SMTP, this error occurs when sending emails through the Other SMTP mailer. Causes There are two main reasons why […]
SMTP Error 554: Transaction Failed
Overview The ‘SMTP error 554: transaction failed’ issue occurs when emails from your website fail to be delivered to the user’s inbox. This error indicates that the transaction between your SMTP server and the recipient’s email server failed. Causes There are several reasons why the ‘error 554: transaction failed’ might occur. Below, we’ll highlight the […]
SMTP Error: MessageRejected (client): Email Address Is Not Verified
Overview The ‘MessageRejected (client): Email address is not verified’ error typically occurs on sites sending emails through the Amazon SES email server. This error prevents emails from being sent successfully through your site when using Amazon SES as your mailer. Causes This error typically occurs if your Amazon account is still in Sandbox Mode and […]
Error: Gmail cURL Error 77
Overview The ‘Gmail cURL error 77: error setting certificate verify locations’ issue occurs when setting up an SMTP server with Gmail’s API. Although it relates to Gmail’s API, it often occurs due to issues from your site’s hosting server and not your SMTP plugin. Causes The Gmail cURL error 77 issue is often caused by […]
SMTP Error 451-4.4.2: Timeout – Closing Connection
Overview The ‘error 451-4.4.2 timeout’ issue often occurs on sites using Gmail’s API to send emails. This error indicates that while the connection between your SMTP server and the recipient’s email server was established successfully, it closed before sending the email due to a timeout. Causes These are some of the common causes of the […]
SMTP Error 442: Connection Dropped During Transmission
Overview SMTP error 442 is a server response indicating a temporary failure when sending emails through your site. This error often occurs when using the Other SMTP mailer to send emails. Causes There are several reasons why SMTP error 442 might occur. Below, we’ve highlighted the most common causes: Network issues: The most common cause […]