Outlook 2010 – Undeliverable: None of your e-mail accounts could send to this recipient.

Over the past few weeks we have noticed an big increase in the number of users who are receiving this kind of message:

From: System Administrator
Sent: 31 July 2012 11:00
Subject: Undeliverable: Email Problem Outlook 2010
Your message did not reach some or all of the intended recipients.
The following recipient(s) cannot be reached:
'itsupport@computersupportnorwich.co.uk ' on 31/07/2012 11:00
None of your e-mail accounts could send to this recipient.

This often seems to happen when users are replying to (or forwarding) incoming messages, though in some situations it does also happen when simply sending an email to a new or existing contact.

The error message above can be seen in many different circumstances, such as a badly configured email client, but if you are confident your email client is properly configured then you may be experiencing a bug whereby the recipients email type is set to MAILTO instead of SMTP. This is a technical way of saying something got fluffed up in the outgoing email.

To resolve the problem in your outgoing email, take these steps:

Draft your email again. Make sure you enter the destination email address(es) in the appropriate TO or CC fields.

Press ‘CTRL-K’ to add the destination email address into your Outlook 2010 Auto-complete list. This shortcut key will underline the email address and allow you to proceed with the next step.

Press the right mouse button on the recipients email address. Choose these buttons to get up the Outlook Properties window:

The Outlook Properties Window appears and this is where your problem (may) lie:

If you see the word MAILTO listed in the Email Type box, that’s your problem. Just press the Internet Type button to reset the Email Type back to SMTP… and your email should resend.

As to why this problem exists at all is a different matter entirely, but it seems to be caused when users click onto an email address which is prefixed by the MAILTO: argument, often used in HTML email stationary.

If this article helped you, or you need further help, please call Computer Support Norwich on 01603 781902.