"Send by Email" Fails for Sending Purchase Order and Sales Order emails fail but all other email send functions are ok

Question

When clicking In a Purchase Order or Sales Order, clicking on "Send by Email" hangs all functions.  120 second server timeout.

Considerations:
- All Incoming and Outgoing servers, ports and aliases are all configured correctly (sales@ auto creates CRM sales leads; support@ auto creates helpdesk tickets, etc.)
- All other email sending functions work - sending direct emails from Contact page, Helpdesk emails, etc.

Finding the error in the server log file: grep -i “error” odoo-server.log

2023-1

Lars Aam · Answer

We have only 1 worker on Odoo.sh [1] and don't experience any problems.  I guess it depends on the number of users and processes accessing the server.

[1] https://Odoo.sh

Baden de Bari · Answer

Alright, I was really looking forward to answering this one for the community, as I have seen a lot of similar posts without an actual solution.  For those still struggling, I hope this can be one of the solutions for you and save you a lot of time.
The issue here, is that prior to sending a PO or SO email, the system generates a PDF.  To generate that PDF you need at least two workers configured on your server, and checking the log for any mail connections would be fruitless for this.
Therefore

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