Outlook calendar invites not received occasionally

A user using Outlook 2010 sends calendar event invitations. Sometimes they are received properly, sometimes they are not received at all (although outbound spam filter that is outside of the network shows they were sent), sometimes they are received as regular messages with attachment "Winmail.dat". The recipients are using Lotus mail client.

I have checked on the sender's Outlook and confirmed that it is NOT set to send RTF, I also checked the individual contacts that they are not set to send RTF.

The sender seems to be sending them in the same manner each time. I would appreciate any help.

Thanks in advance.
Akira Kato
realtimerAsked:
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Sjef BosmanGroupware ConsultantCommented:
Whenever there is a winmail.dat file present, the sender must have sent their mail in rich text format, plus the receiving Domino server and Notes client don't know how to handle that file or are not told to convert them.

Two interesting links, the first for you and the second for the receiving server:
http://email.about.com/od/outlooktips/qt/Prevent_Winmail_dat_Attachments_from_Being_Sent_in_Outlook.htm
http://blog.strongbackconsulting.com/2010/08/solving-dreaded-winmaildat-issue-in.html
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realtimerAuthor Commented:
Thanks but I have already checked it. The user's Outlook is set to send all email in HTML format and not RTF. It is also set to convert from RTF to HTML for internet email.

What I also don't understand is why it works some of the time and sometimes nothing is received by the recipient.
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Sjef BosmanGroupware ConsultantCommented:
I'm sorry, but neither do I...
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realtimerAuthor Commented:
I've requested that this question be deleted for the following reason:

I did not find a solution here or elsewhere. I am deleting this so we can post other questions.
Thanks.
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Sjef BosmanGroupware ConsultantCommented:
Very strange... I'm quite sure that the only way to send/receive a winmail.dat file is when the user sends a mail in RTF format. You can say many times that "the user says that it's not the case", but I'm not so sure about that.

Unless... What version of Domino/Notes do you actually use?
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Steve KnightIT ConsultancyCommented:
Just passing here, but what is the Domino server version involved here... later versions handled winmail.dat files much better.
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Sjef BosmanGroupware ConsultantCommented:
Please, can you answer our question(s)? Thank you.
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realtimerAuthor Commented:
I have personally confirmed Outlook is set to send HTML format. I do not have the information on Domino server as that belongs to the customer of our customer. Our customer has already deferred this case to the recipient's IT and I am no longer pursuing resolution. Thanks for the help.
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Sjef BosmanGroupware ConsultantCommented:
And we still don't know which Notes version is used...
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realtimerAuthor Commented:
Hello - taking this as the best answer.  Could not gather too much information on our end because the sender's network is not maintained by us.
Thank you for the responses.
Regards,
Real-Time
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