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

by Veena Venugopal | Sep 12, 2018 | Server Administration

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....

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

by Visakh S | Sep 8, 2018 | Server Administration

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...

‘550 No rDNS entry for x.y.z.n’ explained and resolved

by Veena Venugopal | Sep 4, 2018 | Server Administration

‘550 no rDNS entry for xxx.xxx.xxx.xxx’ means that there is no reverse DNS record for the sending email server. You may see this error in logs : Tue 2018-09-04 10:36:46: <– 550-Sending server has no reverse DNS (PTR record) Or you may get a bounce...

Email error 554 5.4.0 – What is it, and what are its causes

by Veena Venugopal | Sep 1, 2018 | Server Management

‘554 5.4.0’ is a email bounce error that is usually seen after a server migration or a mail server reconfiguration. Here at Bobcares.com, we help hosting providers (web hosts, VPS hosts, etc.) resolve such errors as part of our Outsourced Tech Support...

How to fix Mail error 450 – Top 5 causes and solutions

by Visakh S | Aug 31, 2018 | Server Management

Bobcares.com provides Server Support to Web hosts, VPS hosts and other hosting providers. As part of our services, we resolve tech support issues posted by hosting users. In these support issues, a common category email error we see is: Server Response: 450 4.x.x...
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