1.5 Email Queue

Aqua Data Server includes a fault tolerant email system. All emails sent from the system are first saved in an email queue. The email queue is stored in the hard drive of the server. If either the machine, the Aqua Data Server instance or the SMTP server go down, the email queue remains stored on the hard drive and all pending emails will be processed once the server is restarted.

A background thread processes each email in the queue and sends them to the configured SMTP server. If the SMTP server is down, the email engine will retry periodically to send the emails. The email engine saves all outstanding emails to disk so that no emails are lost in case of server shutdown. Upon successfully sending an email, the engine can archive the email if the option is enabled.

<USER_HOME>/.aquadataserver/mail/outstanding folder contains all emails that have not yet been sent yet, including valid emails that failed to be sent for various reasons. Failed attempts are logged with the error messages. Aqua Data Server will log failed attempts at sending emails.

<USER_HOME>/.aquadataserver/mail/delivered folder contains all emails that have been successfully sent if the “Archive all emails” option is set “on”

<USER_HOME>/.aquadataserver/mail/invalid folder contains emails that cannot be sent due to errors such as incorrect address format