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SMTP error


Error “Failed to authenticate on SMTP server with username” – Causes & fixes

Almost every PHP application relies on mail functions to send contact requests, newsletters, 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.

But this authentication can sometimes fail with the error:

Failed to authenticate on SMTP server with username "user@example.com" using XX possible authenticators

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Failed to connect to mailserver at – 5 causes & fixes for this PHP error

Here at Bobcares.com, we provide Outsourced Tech Support to web hosting providers. As part of our service, we resolve website errors posted by hosting users.

A common error we’ve seen in PHP applications is:

Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini

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