If a message reached its main recipient but the person on CC or BCC never got a copy, the message almost always left our servers correctly. Here's how to narrow down where the copy went. (If the primary recipient never received the message at all, see Why was my email accepted but never delivered, with no bounce?)
First, check the sending tool
Many sequencers strip or ignore CC and BCC fields on campaign emails and only honour them on manually sent messages. Check the settings of the tool you sent from.
If you're BCC-ing a CRM or logging address, confirm that address is still active and hasn't changed.
If the CC or BCC address is another Maildoso mailbox, it won't be delivered — mail between Maildoso mailboxes isn't routed (see the article linked above).
Then, check the receiving side
Ask the CC or BCC recipient to look in their spam and quarantine folders.
Corporate mail filters frequently hold or silently drop BCC copies, because a BCC copy has no visible recipient header and looks unusual to a filter.
If the copy goes to an address on the same domain as the sender, some providers deduplicate it away.
What we can check for you
For mailboxes sending through Maildoso SMTP, we can look up the delivery log for a specific message and confirm exactly which recipients — including CC — were handed off and accepted by the receiving server. If the log shows the copy was accepted, it was delivered and the loss happened after that point, in the recipient's own mail system.
What to send us
The sending mailbox address.
The CC or BCC address that didn't receive the copy.
The date and approximate time of one example message, and its subject line.
With one concrete example we can pull the delivery record. Contact us with those details and we'll review your case.