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mail server administration


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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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 Bobcares.com, 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 xxx.xxx.xxx.xxx[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)

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

Bobcares.com 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 <name@domain.com>: Reason for the error

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