MailKit fails to authenticate properly with passwords containing certain characters

Question

I have the following block of code to send an email using MailKit:

using (var smtp = new MailKit.Net.Smtp.SmtpClient())                 
{
   smtp.Connect("mail.somedomainname.com", 587, SecureSocketOptions.StartTls);
   smtp.Authenticate("EMAIL ADDRESS GOES HERE", @"PASSWORD GOES HERE");
   smtp.Send(email);
   smtp.Disconnect(true);
} 

When the password in the Authenticate call contains special characters, the authentication will fail. Does anyone know which special characters MailKit will allow/work properly with?

I'm using Visual Studio 2022. .NET Framework 4.8, MailKit version is 3.4.0.0 (runtime version 4.0.30319).

Answer 1

it is most likely an encoding issue. see this thread:

https://github.com/jstedfast/MailKit/issues/1539