HI, I can send any attachments, but when i want to send .ICS files it is not working .
I receive error : "{"At least one recipient is not valid., A message can't be sent because it contains no recipients."}
without attachment the code is sending.
with .txt attachment the code is sending.

What is wrong with the .ics ? Has it something to do with teh content op the ics ?

Hi, the error was not from the attachment.

from the error description, you didn't add any recipient to the email. Please double-check your code and make sure at lease one recipient is added.

Hi,
I understand your reply. But this is not the case.
Double checked the code and the behaviour is quite strange like discribed :
- No attachment : no problem
- .txt attachment : no problem
- .ics attachment . Warning "At least one recipient is not valid., A message can't be sent because it contains no recipients."

In all 3 case the to is filled in ....

Thanks for helping

Karl

Hi Karl,

did you find a final soultion for this?

Best
Peter

It is possible that there is no attendee specified in the ics content.
You can copy/paste the content of ics file here.