Problems with automatic alert email URL's within SharePoint

I have a SharePoint Services 3.0 site that is accessible from the Internet.  Whenever an event occurs such as a new task added to a project task list that causes an email to be automatically sent to the user assigned to the task, the links contained within the alert email point to the SharePoint Server's internal URL (http://companyweb/...).  This is okay when the users of the site are inside the company network, however the links obviously fail when an attempt is made to access them externally.  I would like to know if it is possible to change this default behaviour so that the links in the alert emails point to a URL that can be resolved externally such as

Many thanks,
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Uday EthirajuluCTOCommented:
Use updatealert in stsadm to fix this issue

stsadm -o updatealert -url http://newurl -oldurl http://oldurl

caratechAuthor Commented:
Thanks for your comment Uday.  I have already looked into using this command through the SharePoint Administration Toolkit but I felt that it was not appropriate to my situation since the recommended scenarios for which the command should be used are when either a web application address has changed or a SharePoint migration from an earlier version has been performed.
I don't know if making the change would affect my existing Alternate Access Mappings but I don't want to lose the http://companyweb URL completely by changing it to  I am concerned about the changes that will be made throughout my site collection since it will not be limited to changing the alert URLs only and I want to maintain the use of the internal URL for the Intranet zone.
Configure your smtp based on External IP, I think internally you have configured it to use an internal IP.

Configure it to use the external IP that will allow emails also from internal(LAN/WAN/Domain).

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caratechAuthor Commented:
I have had a look in Exchange System Manager but am reluctant to make any modifications.  If you have experience making the necessary changes then can you guide me through it?
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