Est. Budget: $20.00
We are in a position where we are trying to send mail via SMTP from a C# application written using .NET 4.5. We can send mail without an issue when using a single from address. However, when using a loop to cycle through multiple FROM addresses, we are getting the following error:
Mailbox unavailable. The server response was: Access denied - Invalid HELO name (See RFC2821 184.108.40.206)
I am using SMTPClient in Visual Studio, no ...