In a newly installed SQL Server 2016 Standard AlwaysON Cluster, DatabaseMail was continuously queuing.
After going through all the troubleshooting items, see SQL Server Database Mail - Success, Failure, Logs, Config, I was left with the exact same state as when I started - still a queue.
Next, I went to check the DatabaseMail.exe.config - it was missing ! And here is why.
Queueing:
Use MSDB
go
Exec sysmail_help_queue_sp @queue_type = 'Mail' ;
queue_type length state last_empty_rowset_time last_activated_time
mail 9 INACTIVE 2017-12-02 19:23:25.100 2017-12-02 19:23:25.087
SELECT * FROM msdb.dbo.sysmail_allitems order by send_request_date desc
sent_status
unsent
Solution: Re-create the DatabaseMail.exe.config:
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