This is a possible, but unconfirmed bug.
In a few cases, users will have a voicemail in their mailbox, but no email notification was sent for the message.
In many (but not all) of these cases, the message was the max voicemail length. A theory here is that if the voicemail maxes out and then times out, this results in the message being saved but no email is sent for some reason. This needs to be tested and confirmed first.
Trailing dialplan output from a call that left a voicemail but did not result in an email getting sent:
[2024-12-04 00:52:36.292] > CDR column 'number' with value 'REDACTED' does not match filter of ''. Cancelling this CDR.
[2024-12-04 00:52:45.014] -- <PJSIP/0000069c> Playing 'vm-review.ulaw' (language 'en')
[2024-12-04 00:52:57.396] -- <PJSIP/0000069c> Playing 'vm-review.ulaw' (language 'en')
[2024-12-04 00:53:09.779] -- <PJSIP/0000069c> Playing 'vm-review.ulaw' (language 'en')
[2024-12-04 00:53:22.396] -- <PJSIP/0000069c> Playing 'vm-goodbye.ulaw' (language 'en')
[2024-12-04 00:53:23.079] -- Executing [s@context:4] Hangup("", "") in new stack
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