Webhelpdesk sending duplicate emails

Update.

I've switched from PostgreSQL to SQL Server (express) & the same issue is still happening.

Looking in history_entry I see 3 entries: (I've copied 2 columns) for one email

Entry_Date - Detail_Text 
11:38:23.000 - "Hi Andrew,  Thank you for letting me know..."
11:38:34.000 - An email was sent to Andrew...
11:38:38.000 - An email was sent to Andrew...

Version 12.8.2.1372

Thanks,
Ralph

Update.

I've switched from PostgreSQL to SQL Server (express) & the same issue is still happening.

Looking in history_entry I see 3 entries: (I've copied 2 columns) for one email

Entry_Date - Detail_Text 
11:38:23.000 - "Hi Andrew,  Thank you for letting me know..."
11:38:34.000 - An email was sent to Andrew...
11:38:38.000 - An email was sent to Andrew...

Version 12.8.2.1372

Thanks,
Ralph

I have not seen this behavior before, what E-Mail Vendor are you using, and what connection method within WHD?

We're using Exchange/Office365 & OAuth (we're a onmicrosoft.com client with a Tenant ID etc), outgoing mail smtp.office365.com

Within your template_wrapper.conf found in folder {webhelpdesk}\bin\wrapper\conf do you have an entry wrapper.java.additional.19=-Dwhd.12.7.8.not.send.mail.individually=false ?

I certainly do...
wrapper.java.additional.19=-Dwhd.12.7.8.not.send.mail.individually=false

Also got it in wrapper.conf

Same as me then and we have no issues as you describe, what about Scheduled E-Mail Delivery Threshold - Setup > E-Mail > Options > Outgoing Mail section?

Scheduled E-Mail Delivery Threshold is set to 5 (I haven't touched this since installation)

Can you try 1 and see if that helps.....

Thank you, that seems to have cured it. I hasn't sent a duplicate in 4 days

Ralph

Support suggested this a while ago but did not give a reason why it helps. I think something about parallel or serial processing of Outbound Mail Jobs but if it resolves, hey ho, result!