The send_immediately or send_message method in pyramid_mailer are blocking thread, when using in a batch sending program, for example, send email to members in a group could be a bad idea. The code executed after email sending part has to wait for it to be finished. In a worst scenario when the network becomes slow or remote smtp server is down then the whole batch program will be hanging there waiting for the emails to be send. So I have been spending hours of time to figure out how to implement send_to_queue feature of pyramid_mailer. I setup a local postfix smtp server and configure a relay smtp server of my ISP. Then I use the "qp /path/to/maildir" to pickup the emails there and send out the email. Doing this way I just "let go" the email sending portion my code in the batch, delegate the sending task to the external qp program. So I arrange the running of the qp at the end of the batch as the last task. I'm wondering if this is the best way of implementing "send_to_queue", I'm not a system administrator who familiar with the mail system, I'm expecting somebody can give me suggestion on this topic.
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