The following sending example fails silently if the IP Pool Name does not exist. This is a serious bug, as it can easily go unnoticed. It fails to send when this happens. I think the issue may be server-side, and less-so in the client library. ```python import sendgrid from loguru import logger from sendgrid.helpers.mail import ( Attachment, Content, Email, IpPoolName, Mail, ReplyTo, Subject, To, ) def send_email( *, message_html: str, subject: str, to_emails: list[str], reply_to_email: str | None = None, attachments: list[Attachment] | None = None, ) -> None: """Send email using Sendgrid.""" sendgrid_api_key = "API_KEY_HERE" sg_api_client = sendgrid.SendGridAPIClient(api_key=sendgrid_api_key) msg = Mail() msg.from_email = Email("someone@example.com") # Replace with your own. msg.to = [To(i) for i in to_emails] msg.subject = Subject(subject) msg.content = Content(mime_type="text/html", content=message_html) if reply_to_email is not None: msg.reply_to = ReplyTo(reply_to_email) if attachments: msg.attachment = attachments # See doc above for how to craft attachments. # Use our dedicated IP pool to increase trust score. # Note: If you give a bad/wrong value here, sending fails silently. Wacky. msg.ip_pool_name = IpPoolName("ip-pool") response = sg_api_client.send(msg) if response.status_code != 202: # 202=Accepted logger.warning( "While sending email, the SendGrid API return a non-success status code " f"({response.status_code}). " f"Error Message: {response.body}. Headers: {response.headers}." ) ```