Delivery has failed to these recipients or distribution lists error

[dmytro....@gmail.com]

When an e-mail is sent to TodMcLaren<To...@costco.com> I am getting the
error below. Could somebody help understand what is causing this
issue? I tried sending it again to the same address and it works
fine...

Delivery has failed to these recipients or distribution lists:

Tod McLaren
The format of the recipient's e-mail address isn't valid. A valid
address looks like this: user...@contoso.com. Microsoft Exchange will
not try to redeliver this message for you. Please check the e-mail
address and try sending the message again, or provide the following
diagnostic text to your system administrator.

[Jamestechman]

Possibly outlook is malformatting the address; remove everything in
the email address such as description brackets etc and just put in the
email address and try sending again.

James Chong (MVP)
MCITP | EMA; MCSE | M+, S+,
Security+, Project+, ITIL
msexchangetips.blogspot.com

[Lanwench [MVP - Exchange]]

Who was having the problem? The email address wasn't entered properly.
Perhaps there was an autocomplete issue. Have them test using OWA and
manually entering the address. If that works, they did something funky in
Outlook - they may need to delete the autocomplete entry and manually enter
the SMTP address again.

[dmytro....@gmail.com]

On Dec 11, 5:52 pm, "Lanwench [MVP - Exchange]"

Thank you for quick replies.

If the e-mail is entered by hand, it works. I will check now if the
contact had a problem. I read here http://microsoft.mailarchive.ca/public.exchange.admin/2007-03/4523.html
that instead of SMTP address "Display as" address can be sometimes
passed by Outlook.