That’s why you need to implement an “outbox”. All client email system have this issue. There is a delay between the client clicking send, and the mail system ability to deliver to the first server in the chain. This state is usually represented as outbox,
while the client is waiting to send.
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Re: Suggestion Needed: Syncing Mailbox through API
May 20, 2020 02:47 PM|bruce (sqlwork.com)|LINK
That’s why you need to implement an “outbox”. All client email system have this issue. There is a delay between the client clicking send, and the mail system ability to deliver to the first server in the chain. This state is usually represented as outbox, while the client is waiting to send.