I have an application in Vb 2013 and Net Framework 4.0. Users send e-mails with attachments less 500KB and cc it to multiple addresses.
Its been working fine until about a month ago. Now every now and then we get an exception - Failure sending message. This happens on a couple of computers and the rest are fine. I just don't know what can be happening here. We have a mix of Win 7 and Win 8 systems.
I understand it has something to do with Net Framework 4.0. My code has been working for years until I upgraded to Net 4.0 and this started happening. The strange part is some computers it works fine while others get this message.
I have seen posts where MS know this is an issue on some computers and has a fix for it but cant get without paying for it. I need help with this.
Thanks
Sunil Prasad