![]() The recipient will receive the mail once it’s downloaded from the email server via POP3 or IMAP. The server will then relay the mail to the recipient’s email server. When you send an email, it will be forwarded from your email client (such as Microsoft Outlook, Gmail, or Mozilla Thunderbird ) to the SMTP server. If this is not possible, we’ll help website owners to loosen the security restrictions using the below steps.Simple Mail Transfer Protocol (SMTP) is a set of commands that directs the transfer of emails. Ideally, we reconfigure the app so that it meets the Google standards. Users who authenticate to Gmail server receive the error “ smtp error: could not authenticate” because Google considers username and password login as insecure. If an app doesn’t meet these security standards, it may block access because these apps are easier to break into. Gmail enforces strict security restrictions. So, the solution here is to properly configure SSL for the server or remove the encryption used in the SMTP settings. We’ll also verify the validity of mail server’s SSL certificate using the command: openssl s_client -connect :25 -starttls smtp Our Support Engineers ensure that Apache and PHP are properly configured on the server with ‘ mod_ssl‘ and ‘ openssl‘ so that SSL can work on the server. What if users specify encryption in their application? Result is “ smtp error: could not authenticate” error. SSL and TLS are the 2 encryption protocols used.īut, on some mail servers, SSL/TLS support may not be enabled or the existing SSL certificate may have expired. If we find any firewall restrictions, the IP should be whitelisted in the firewall.įor secure email transmission, most users prefer SMTP with encryption. We cross-check the SMTP settings in the application and make sure that correct SMTP host and port is used. dig Īlso, to identify the correct SMTP port and confirm connectivity to the SMTP port, we use the command: telnet 25 We’ll ensure the DNS connectivity of the mail server with the command. Incorrect port entry in SMTP settings or firewall restrictions may cause email delivery errors. It is also possible that some email providers restrict access to their SMTP port using firewall rules. Similarly, for port numbers, the default SMTP port is 25, but some mail servers use custom ports, such as 587, to avoid spam.Īlso, some mail servers will be configured to allow emails only via SSL port 465. Sometimes, a typo in the hostname or an inactive mail server result in this error. įor example, if you use Gmail as your mail server, the hostname should be “ “. Users should enter the mail server details in the “ $mail->Host” field of the email application. In case of default email accounts, the full should be given in the application.Īlso, if the password was recently modified, it should be updated in the email application. We’ll ensure that correct username and password are given in the mail script. If this authentication fails, the mail server rejects the connection and users receive the error “ smtp error: could not authenticate“. When you send an email from your script, the mail server attempts to identify the user with the account’s username and password. ![]() Causes and Fixes for “smtp error: could not authenticate” error in phpmailerĮach mail server uses an authentication system to validate users before they can connect and send emails. What’s wrong here? Let’s have a quick look. Application was not able to connect to the SMTP server.The PHP application was able to connect to SMTP server, but the authentication failed.Simply put, this error says: “ You try to connect to SMTP server, but it can’t authenticate you“. What is this “smtp error: could not authenticate” error? Today, let’s see the top 5 reasons for this error and how our engineers fix it. “ smtp error: could not authenticate” is one such problem reported by website owners when using PHPmailer to send emails.Īt Bobcares, we resolve such email errors as part of our Outsourced Technical Support for web hosting providers. PHPMailer is a great tool to send emails safely and easily using SMTP authentication.īut, sometimes this may fail due to incompatible server settings or incorrect SMTP configuration.
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