Most common causes for emails not going through

Most common causes for emails not going through

Are the occasional emails not going through? Here are the most common causes

  • ‘Email address misspelt’ accounts for 99% of email delivery problems, in my experience. Check you have spelt the bit after the ‘@’ correctly first by copying the domain and pasting it into your browser address bar. If it doesn’t resolve to a website, it’s probably because of that
  • Carefully check the first part of the address is right (usually the recipient name). Some email accounts aren’t set up to catch misspelled email addresses so a simple extra ‘.’ In the name might mean the difference between being received or rejected
  • Following on from the previous points; is the domain extension right? Have you sent the email to ‘’ when it should have gone to ‘.com’ instead?
  • Big attachments will cause many emails to be rejected. Many email addresses won’t accept attachments over 10MB. Try sending without the attachment
  • Check with your internet connection supplier. Some draconian setups from certain providers, who will remain nameless, put very heavy restrictions on sending email through their lines. On occasion, sending too many email triggers restrictions and in other instances, recipient’s domain names have had to be defined with them in advance
  • Firewalls and spam filters aren’t always particularly fond of emails that contain links, images and attachments (particularly executables). Even emails that are too short sometimes trigger spam filters. Try writing a plain text email with no attachments to see if this is the cause
  • If you’re using a mail server, such as Exchange, there is a chance that it is incorrectly configured. This has been the cause of several of our customer’s problems in the past.

If all of the steps above don’t work, try the following

  • Call the recipient and ask them to email you. Replying to their email means you take human error out of the equation
  • Email them from a different email account on a different server, e.g. Hotmail, Gmail or Yahoo Mail. This takes any potential SMPT error out of the equation

Still not working? Then it’s probably due to your emails being blocked or bounced by the recipients Spam filter. Contact their IT support and ask them to add your domain to their ‘safe senders’ or ‘white’ list

Written by Chris

February 28th, 2011 at 9:46 am

Posted in Tutorial

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