Possible reasons for attachment loss?

[Kukulkan]

Hi,

I modify an existing answer e-mail item (Re using redemption objects
(VB6 AddIn project). Here is the affected code (simplified):

Dim rMail As New Redemption.SafeMailItem
Dim rgfAttachment As Redemption.Attachment

Mailobject.Save ' answer mail item
rMail.Item = Mailobject

' ### kill previous attachments ###
For x = rMail.Attachments.Count To 1 Step -1
rMail.Attachments.Item(x).Delete
Next x

' ### add new attachment ###
Set rgfAttachment = rMail.Attachments.Add("c:\new_attachment.abc",
olByValue, 1)
rgfAttachment.Fields(&H370E001E) = "application/vnd.myapplicationname"

rMail.Save

rMail.Send

For most customers this works fine. But some of my customers are
missing the newly added attachment completely. But only if the
original Mailobject has been an answer-mail (Re that has been sent
from the same domain as the current user (exchange). If the Mailobject
is an answer to an incoming mail from the outside or the Mailobject is
a newly generated mail, if works fine. If it is an answer to an
incoming mail from inside the same domain, it fails by loosing the
attachment. Strange...

Any ideas what happens here? Are there some filtering mechanisms
active? There is no error occuring during this code. The customer does
not run any special addins other than the standard, exept OpenCTI
(telephony addin).

Any ideas, what mechanism's are able to remove attachments from AddIn
generated mails?

Thank you

 

[Ken Slovak - [MVP - Outlook]]

What Outlook versions is this happening with? Where and when are you adding
the attachments that are going missing? Are the original attachments all
being removed? Any specific mail formats or WordMail involved?