Email Delivery Issues¶

Delivery problems can affect one recipient, one sending service, or an entire domain. Use the bounce message and message headers to identify where the failure occurs.

Messages you send are delayed or rejected¶

1. Check the Outbox and Sent folder to see whether the message left your app.
2. Read any delivery status notification. Note the recipient, error code, and explanation.
3. Check that the recipient address is spelled correctly and ask the recipient to check their spam folder.
4. If the rejection mentions sender authentication, ask the domain administrator to verify SPF, DKIM, and DMARC for the sending domain.
5. If only one recipient’s domain rejects the message, give the full bounce notice to support for review.

Messages sent to you are missing¶

1. Check webmail, Spam/Junk, Trash, and any filters or forwarding rules.
2. Ask the sender to verify the address and provide the bounce notice, if one was generated.
3. If several senders are affected, ask the domain administrator to verify the domain’s MX records and mailbox storage.
4. If only one sender is affected, ask them to check their sending system and authentication records.

Use headers to investigate¶

The message headers may show the route, authentication results, and spam-filter decision. See Spam Score and Header Analysis. Headers can contain private information, so share them only with trusted support staff.

When contacting support, include the date and time (with time zone), sender and recipient addresses, full bounce text, and whether the issue affects one or multiple recipients. Do not include passwords.