Sending email with C# sdk gmail block
I created a SendGrid account (free tier for the moment), and implemented API to send emails from my C# application.
The process seems to work mostly (it ONLY sends a single recipient after a successful credit-card charge), but about half(!) of @gmail.com recipients are rejected and appear in my “blocks” report as:
" 555 5.5.2 Syntax error. p10-20020a170902bd0a00b0014f8706592csi12525509pls.0 - gsmtp"
With different codes..
the code is pretty much the same as instructed:
var client = new SendGridClient(sendGridApi);
var from = new EmailAddress("[email protected]s.com", "My Name");
var to = new EmailAddress(recipient);
var msg = MailHelper.CreateSingleEmail(from, to, subject, "", htmlContent);
var response = await client.SendEmailAsync(msg);
again, the code above DOES send emails successfully, but not always, and when not, the response is this opaque "555 5.5.2 Syntax error...."
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