This error gets triggered when there was an attempt to hand over an email message through before authenticating the connection with your SendGrid username and API key. If you’re getting an “Unauthenticated Senders Not Allowed” error, the problem usually lies in authenticating with our SMTP server. If the mail server communicates with more than just us, add this certificate to your existing CA bundle (frequently called ca-bundle.crt). Restart Postfix to make the change take effect.Tell Postfix where to find it by adding or editing the following line in /etc/postfix/ main.cf: "smtp_tls_CAfile = /etc/postfix/ssl/gd_bundle-g2-g1.crt".Download the GoDaddy CA bundle from (grab the one called "gd_bundle-g2-g1.crt").If you receive this error, the connection is still encrypted it's just that your server doesn't have the necessary CA (certificate authority) certificates to confirm that our certificate is valid. "certificate verification failed for ():587: untrusted issuer /C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority" We also recommend uploading your JSON into a JSON validator, because this is often an invalid JSON issue. If this happens, the email should give you the information you need to begin troubleshooting. You may also see errors on your Email Activity page or in your Event Webhook data. When you try to send an invalid X-SMTPAPI header, you will get an email with details about the invalidations. To turn off click tracking, add this to your X-SMTPAPI header: This is what SendGrid displays when the reciepients server returns a blank reason code. `Delayed Bounce - Unable to Parse Server Reason` There is often a human readable portion of this error that gives more detailed information, but if not, remove these addresses from your list. This is a default response that can be caused by a lot of issues. The message was refused because the mailbox name is either malformed or does not exist. We don't resend messages with this error code because this is usually a sign this is an abandoned email. The recipients mailbox has exceeded its storage limits. Create a shorter message body or remove attachments and try sending it again.` `This message is larger than the current system limit or the recipient’s mailbox is full. The intended mailbox does not exist on this recipient server. Remove these address from your list - it is likely a fake, or it was mistyped. Usually because it could not be found, or because of incoming policy reasons. `Requested action not taken: mailbox unavailable` We continue to retry messages for up to 72 hours. The message has been deferred due to insufficient system storage. `Too many recipients received this hour (throttled)` There is a credit limit of emails per day enforced in error. `Authentication failed: Maximum credits exceeded` The message simply failed, usually due to a far-end server error. `Temporary local problem - please try later` Consider temporarily sending less messages to a domain that is returning this code because this could further delay your messages currently being tried. The message failed because the recipient's mailbox was unavailable, perhaps because it was locked or was not routable at the time. `too frequent connects from 198.37.147.135, please try again later.` We continue to retry deferred messages for up to 72 hours. Messages are temporarily deferred because of recipient server policy - often it's because of too many messages or connections in too short of a timeframe. `Message from (X.X.X.X) temporarily deferred` To learn how to resolve this error, see our (for-developers/sending-email/sender-identity/). Mail cannot be sent until this error is resolved. This means the "from" address does not match a verified Sender Identity. `You are not authorized to send from that email address` Your mail has been successfully queued! This response indicates that the recipient server has accepted the message.
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