public async Task <EmailValidationResult> VerifyEmailAddress(string emailAddress)
{
//basic validation first
if (string.IsNullOrWhiteSpace(emailAddress) || _regex.Match(emailAddress).Length == 0)
{
return(new EmailValidationResult(emailAddress));
}
//now get the domain
var domain = emailAddress.Substring(emailAddress.IndexOf('@') + 1);
try
{
await Dns.GetHostEntryAsync(domain).ConfigureAwait(false);
var mxResponse = await Dns.QueryAsync(domain, QType.MX).ConfigureAwait(false);
return(new EmailValidationResult(emailAddress, true, true, mxResponse.RecordsMX.Any()));
}
catch (SocketException)
{
return(new EmailValidationResult(emailAddress, true));
}
catch (AggregateException ex)
{
if (ex.InnerException is SocketException)
{
return(new EmailValidationResult(emailAddress, true));
}
throw;
}
}
