Macbook Pro Mojave 10.14.6
Yesterday I composed an email w/2 attachments [46MB]. I clicked the Send arrow at top of email but did not hear swoosh sound.
I checked all Sent boxes but this email was not in any mailbox. I contacted Applecare tech support but they could not find it on my system.
The email has not been rejected/returned and I haven’t heard from intended recipient as to whether he received it.
How can I be sure the email was sent out as intended?