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Server Management Blogs

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 "" using XX possible authenticators


How to speed up your website by 50%

Google hates websites that takes over 200 ms to load. The end result? A huge drop in your page rank and visitors abandoning your websites.

How to speed up your website?

If you notice website slowness, act quickly before Google acts. Here’s our tried-and-tested 10 point checklist to speed up your website in no time. (more…)

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

Here at, 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


How to scan server for malware

How to scan server for malware

Google blacklists up to 6,000 websites EVERY DAY for serving malware. Almost all of these sites are classified as “compromised sites”, which means it was infected with malware without the knowledge of the site owner.

A malware infection could lead to loss in SEO ranking, and business reputation. Building back the site traffic could take weeks, if not months.


Private label support – 3 tips to ensure 100% transparency

Running a business can be hard.

And it can be especially hard for small companies that doesn’t have a big staff strength.

As an SMB owner, you’re always pressed for time. From sales & billing to product development & marketing, everything waits for your attention. (more…)

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

‘550 no rDNS entry for’ 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 back message :>: host mail.[destination_ip] said: 550 No rDNS entry for 100.200.300.400 (in reply to RCPT TO command)


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

554 5.4.0‘ is a email bounce error that is usually seen after a server migration or a mail server reconfiguration.

Here at, we help hosting providers (web hosts, VPS hosts, etc.) resolve such errors as part of our Outsourced Tech Support services.

A typical email bounce looks like this:

host[yyy.yyy.yyy.yyy] said: 554 5.4.0 id=03742-03-6 - Rejected by next-hop MTA on relaying, from MTA(smtp:[zzz.zzz.zzz.zzzz]:31142): 554 5.4.0 Error: too many hops (in reply to end of DATA command)


How to fix Mail error 450 – Top 5 causes and solutions provides Outsourced Hosting 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 <>: Reason for the error


Quickly fix WordPress 404 error in websites

Quickly fix WordPress 404 error in websites

WordPress is a commonly used and easily manageable CMS software for websites. But a simple configuration error can end up breaking the website.

404 error usually happens in websites when there is a broken link or missing page in it. A website with broken links would not appeal to the visitors and you’d lose business. (more…)

Apache high memory usage – 5 easy ways to fix it

Apache is popular, but it often gets a bad rap for poor performance.

Apache high memory usage is found to cause of slow sites, page timeouts, mail bounces and more.

And here at Bobcares, our Support Engineers help web hosts, digital marketers and other online businesses keep their Apache servers super fast and stable.


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