![]() Connection allowed only via SSL/TLS protocol corporate gateway) to be used, we whitelist the web user to remove limits on mails.Ĥ. Whitelist the user : If the webmaster requires an external SMTP server (eg.This fixes the need to establish a remote SMTP connection, and prevents a future block. Use the local mail server : We help webmasters to reconfigure their app to send mails through the mail server running within the web server.Solution : There are two ways to fix this: Google) to send mails are blocked because of this reason. We’ve seen cases where websites that use an external server (eg. Solution : In such cases we systematically go through the app settings and PHP config to eliminate duplicate entries, and fix the PHP config path.Īs a measure to block spam scripts, some web servers do not allow outgoing SMTP connections from web applications. We’ve seen cases where the SMTP server name or port is specified wrong. Similarly, many apps rely on default PHP settings if SMTP settings are not defined within the app. When the app uses the wrong config file, mail connection fails. Sometimes, after an app update or migration, we’ve seen multiple versions of the config file, often with conflicting connection settings. Many PHP frameworks such as Laravel use “.env” files to store SMTP connection settings. Solution : To fix and prevent this issue, we whitelist the web app’s IP in the firewall, so that it will never be blocked again. Fail2Ban) classifies the web app IP as a spam source, and blocks it. We’ve seen cases where, after a mail campaign or testing, the sending MX’s firewall (eg. It’ll block IPs that seems to be sending automated spam. Mail mail servers are armed with brute force attack detectors. Now, why would this happen? Let’s take a look at the top 7 causes. The app was able to connect but the login failed.The PHP app wasn’t able to connect to the SMTP server, or.Simply put, this error says, “ I tried to connect to the SMTP server to authenticate, but couldn’t.” Today, we’ll take a look at the top reasons. ![]() ![]() In the course of our work, we see many reasons for the error “ Failed to authenticate on SMTP server with username“. We monitor & maintain these servers, and troubleshoot tech errors. Here at Bobcares, our Support Engineers maintain thousands of PHP web servers of web hosts, digital marketers, web developers and more. The most secure way to send these mails is to use SMTP authentication – that is, the PHP app uses a username and password to transfer mails to an SMTP server.īut this authentication can sometimes fail with the error: Failed to authenticate on SMTP server with username using XX possible authenticators Almost every PHP application relies on mail functions to send contact requests, newsletters, and more.
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