Sending email from within a web service

I have a method which sends email to & from a specific account. All was
working fine until the server was upgraded to an AD/DNS server. Now the
email never goes through.

I can run the same code from an exe and it works fine.

MailMessage mail = new MailMessage();

mail.Body = msg;
mail.From = emailfrom;
mail.To = emailto;
mail.Subject = "Test.";
mail.Fields["http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";]
= 2;
mail.Fields["http://schemas.microsoft.com/cdo/configuration/smtpserver";]
= "mail.mydomain.com";
mail.Fields["http://schemas.microsoft.com/cdo/configuration/smtpserverport";]
= 25;
mail.Fields["http://schemas.microsoft.com/cdo/configuration/sendusername";]
= "sender@xxxxxxxxxxxx";
mail.Fields["http://schemas.microsoft.com/cdo/configuration/sendpassword";]
= "******";

SmtpMail.SmtpServer = "mail.mydomain.com";
SmtpMail.Send(mail);

Does the service need to be granted a certain permission?



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