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email errors


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

‘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 back message :

user@destinationdomain.com>: host mail.[destination_ip] said: 550 No rDNS entry for 100.200.300.400 (in reply to RCPT TO command)

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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 ‘SMTP AUTH is required for message submission on port 587’ error in cPanel/WHM servers

Mail servers have an SMTP authentication feature enabled in them, to validate users who try to send mails through that server.

The ‘SMTP AUTH’ error usually happens when users try to send mails without properly authenticating their mail account in email clients such as Outlook or Thunderbird. (more…)

Top 5 reasons for ‘exim has failed’ error in cPanel servers and how to fix them

Top 5 reasons for ‘exim has failed’ error in cPanel servers and how to fix them

cPanel/WHM is the most commonly used control panel in hosting industry. In our role as outsourced hosting support specialists for web hosting companies, we resolve many errors related to the control panels.

Using the WHM, it is easy manage various services in the server, but there are many situations where these features fail or give errors, and expert intervention is required. (more…)

How to resolve “Sender verify failed” SMTP mail error in cPanel/WHM Exim servers

How to resolve “Sender verify failed” SMTP mail error in cPanel/WHM Exim servers

SMTP error from remote mail server after RCPT TO:<user2@domain2.com>:
host mx.server.com [xxx.xxx.xxx.xxx]: 550-Verification failed for <user1@domain1.com>
550-No Such User Here
550 Sender verify failed

Bobcares provides website management services to website owners. Email errors are the most commonly encountered issues by the end customers.

Amongst these mail errors, ‘Sender verify failed’ is a prominent error that creates so much hassle to account owners. We’ve seen that it can be caused by issues ranging from improper file permissions to RFC non-compliance. (more…)

How to resolve and prevent 554 5.7.1 : Relay access denied email errors in Linux and Windows mail servers

How to resolve and prevent 554 5.7.1 : Relay access denied email errors in Linux and Windows mail servers

Emails play a crucial role in online communication. Business orders to meeting invites, lost or delayed mails can end up creating disgruntled customers.

In our role as Website Support Specialists for online businesses, we resolve hundreds of mail issues every day. A commonly encountered email bounce error faced by web hosts, website owners and server owners is:

554 5.7.1 <user@recipient.com>: Relay access denied (more…)

How to fix email error 552 – ‘5.3.4 Message size exceeds fixed maximum message size’ in Exchange servers

How to fix email error 552 – ‘5.3.4 Message size exceeds fixed maximum message size’ in Exchange servers

Users sending messages with attachments to recipients hosted in Exchange servers can end up receiving bounce mails due these attachments.

Our Hosting Support Engineers support hundreds of Exchange servers for web hosts, web designers and other online businesses.

In these servers, we’ve seen huge attachments or unsupported attachments formats causing email error 552.

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How to fix email error ‘501 5.1.7 invalid address’ in Exchange servers

How to fix email error ‘501 5.1.7 invalid address’ in Exchange servers

A commonly noted error in Microsoft Exchange 2007 server is when the emails from certain 3rd party applications or scripts fail to deliver.

The mails get rejected, giving this error message in the logs:

SMTP MAIL command failed Error (501) 5.1.7 Invalid address

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How to fix ‘571 Delivery not authorized message refused’ error in Exchange server

How to fix ‘571 Delivery not authorized message refused’ error in Exchange server

At times, when you send mails to a certain recipient address, it may fail to deliver, giving the following error message:

An error occurred while trying to deliver this message to the recipient's e-mail address.
 Diagnostic information for administrators:

Remote Server returned Requested #571 Delivery not authorized message refused

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