email signature in Ms Outlook displayed as attachment - outlook

I am trying to send an email with a picture signature using Ms Outlook but when the recipient receive the message, It appears like it has an attachment even if i have not attached anything. Please help.

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On-send add-in not loading after Outlook error

I am developing an Outlook 'on-send' add-in which loads a dialog box if the email is addressed to multiple recipients after the send button is pressed. In the dialog, the user confirms the intended recipients from a list and then presses send. The add-in then allows the send event to happen.
A problem arises if the emails are not formatted correctly; Outlook throws a ‘does not recognise email’ error after trying to send the email. The problem is that when I try to send the email again after the error, the add-in does not load. The add-in should load every time the user tries to send an email to multiple recipients.
Please see a video of this behaviour here: https://youtu.be/U1VFuy1qbHM
As you can see from the video, the email goes to my Outbox fine after the first send. However, Outlook throws an errors when I edit the email in my Outbox and try to send it again (presumably because I was using a made up email to test with). As you can see, if I then update the emails and click send, the email sends without the add-in loading again. The intended functionality of the add-in is that another dialog box should be displayed in this case.
This behaviour also occurs when you reply to an email where the recipient has their email address formatted differently. For example, 'Name Surname (name.surname#domain.com)' instead of 'Name Surname <name.surname#domain.com>'. Outlook does not seem to like this format and throws a similar error after trying to send the email. After updating the email format and clicking send, the add-in does not load again.
The error occurs in Win32.
I do not think the problem is with the Javascript. I think the add-in does not even load when I try to resend the email. Maybe the add-in is somehow holding onto the ‘True’ value of the on-send event from the previous dialog box? I have tried editing the different ‘ReadorEdit’ values in the Manifest file to try and ensure the add-in loads for all cases but it has not helped.
What can I do to ensure the add-in loads after these errors?
Thank you for your help- it is very much appreciated.

How to Outlook Reply with attachment c#

When I reply to incoming mail, attachs are deleted. How do I add attachments to new mail with vsto addin?
Do you mean the original email attachments are removed from the new item? Why is it a problem? That is the expected behavior. Note that embedded images attachments are copied to the new message.
You can save the original attachments by looping through the MailItem.Attachments collection and calling Attachment.SaveAsFile. You can then add the attachments to the new message by calling MailItem.Attachments.Add.

Outlook doesn't show appointment directly

I'm using ABAP in SAP to generate an appointment in .ics Format and Mail this. If I open Outlook the Appointment is always an E-Mail which has the appointment as attachment. But I want the appointment to be direct identified by outlook, so that I can react with "Accept" "Reject" etc. The Image below shows the E-Mail which is generated with the ICS Event Content. If I use Googlemail it works. Someone has an idea? I'm missing the RSVP Buttons
Try to save any appointment item in Outlook manually using the .ics file format. Then try to open that file from a hard drive. If it is opened correctly you just need to find the missed part/difference between two .ics files (generated by Outlook and yours).
The issue probably lies in MIME structure of the email that you are sending, not in the ics file itself. See Multipart email with text and calendar: Outlook doesn't recognize ics

How to add a HTML RSVP Form in a reply email from a hyperlinked image in Outlook

I created a PNG invitation with a RSVP button which I copied to the body of an Microsoft Outlook email. I clicked the Hyperlinked option which took me to a screen where I chose the Email Address option. By adding the email address in the required section I tested it by sending it to myself but when I opened the email and clicked on the image, the reply mail in a separate screen opened with only the mail to and subject section filled in. What do I do to get the email to open with the html form embedded in the email which the recipient can fill in and RSVP? Please help, I am on deadline.
You can't - mailto url only lets you pass recipients, subject, and body. No HTML body or attachments are possible.

Is there a way to find an email message from Outlook inbox via InternetMessageId via C#?

I have an InternetMessageID for an email item. I'd like to open a Reply email dialog to an email with this InternetMessageID. How can I find the email from Outlook API by InternetMessageID?
Internet message id as in "Message-ID" MIME header? Use Items.Find/FindNext or Items.Restrict to search for the PR_INTERNET_MESSAGE_ID (DASL name http://schemas.microsoft.com/mapi/proptag/0x1035001F) property.

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