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Did you type the email address in manually or selected it from the contacts or the auto-populate?<br />
Try sending a test message to that email address and type it out manually, please.<br />

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Did you type the email address in manually or selected it from the contacts or the auto-populate?
Try sending a test message to that email address and type it out manually, please.


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We have done that..<br />
<br />
If we type address manually and start a new email - sent OK.<br />
<br />
It only seems to go wrong when we go to &quot;reply&quot;<br />
<br />

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We have done that..

If we type address manually and start a new email - sent OK.

It only seems to go wrong when we go to "reply"



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We are using Outlook 2007 on 64bit PC.<br />
<br />
When we send an email to one address, the emails doesn't send but stays in the Outbox. <br />
<br />
We have closed outlook and then re-opened it but the email will not leave the outbox.<br />
This happens with only one address, all others are absolutely fine..
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We are using Outlook 2007 on 64bit PC.

When we send an email to one address, the emails doesn't send but stays in the Outbox. 

We have closed outlook and then re-opened it but the email will not leave the outbox.
This happens with only one address, all others are absolutely fine..

Outlook Crashes when send mail

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.