Sendgrid email delivery status

SendGrid provides a range of email delivery status codes that indicate the outcome of an email delivery attempt. Here are some common SendGrid email delivery status codes:

Delivered

• 202 Accepted: The email was accepted by the recipient's mail server and is being processed.
• 250 Requested mail action okay: The email was delivered to the recipient's mailbox.

Failed

• 450 Requested action not taken: The email was not delivered due to a temporary issue with the recipient's mail server.
• 550 Requested action not taken: The email was not delivered due to a permanent issue with the recipient's mail server.
• 552 Requested mail action not taken: The email was not delivered due to a quota or storage issue with the recipient's mail server.
• 554 Transaction failed: The email was not delivered due to a permanent issue with the recipient's mail server.

Bounced

• 5.1.1: The email address is invalid or does not exist.
• 5.1.2: The email address is valid, but the recipient's mail server is not accepting emails.
• 5.2.1: The email address is valid, but the recipient's mail server is not accepting emails due to a temporary issue.
• 5.3.0: The email address is valid, but the recipient's mail server is not accepting emails due to a permanent issue.

Spam

• 5.7.1: The email was flagged as spam by the recipient's mail server.
• 5.7.5: The email was flagged as spam by the recipient's mail server due to a high volume of emails sent from the same IP address.

Other

• 421 Too many connections: The email was not delivered due to a high volume of connections to the recipient's mail server.
• 451 Requested action not taken: The email was not delivered due to a temporary issue with the recipient's mail server.
• 550 Authentication failed: The email was not delivered due to an authentication issue with the recipient's mail server.
• 554 Message not accepted for policy reasons: The email was not delivered due to a policy issue with the recipient's mail server.

You can find more information about SendGrid's email delivery status codes in their documentation: https://docs.sendgrid.com/for-developers/sending-email/sending-email-status-codes

It's also important to note that SendGrid provides a range of tools and features to help you troubleshoot and improve your email delivery, including:

• Email delivery reports: SendGrid provides detailed reports on email delivery, including bounce rates, spam rates, and delivery rates.
• Email analytics: SendGrid provides analytics on email engagement, including open rates, click-through rates, and conversion rates.
• Email validation: SendGrid provides email validation tools to help you ensure that your email list is accurate and up-to-date.
• Email warming: SendGrid provides email warming tools to help you gradually increase your email sending volume to avoid triggering spam filters.

By using these tools and features, you can improve your email delivery rates, reduce bounce rates, and increase engagement with your email campaigns.