SSLError about django-anymail HOT 2 CLOSED

This is the requests package reporting that it can't successfully set up a secure network connection from your machine to Mailgun. The relevant root error is SSLError: bad handshake: SysCallError(-1, 'Unexpected EOF') -- try searching the web for that and you'll find a variety of possibilities and troubleshooting suggestions.

Since this stopped working recently, what changed? Did you upgrade your OS, Python, OpenSSL, requests, django-anymail, or any other packages? Did your networking environment change? New firewall rules (from you or your hosting provider)? Are you connecting through a proxy that might have changed? Any other config changes?

If none of that leads you to a solution, then it would be really helpful to have more details about your environment: OS version, exact Python version, versions of Anymail, requests, and OpenSSL, how you're hosted and any unusual network config, etc.

from django-anymail.

Thank you for your help. It was indeed not an issue with this package. I found the reason: I am using threading to send emails. But I disabled the enable-threads setting in uwsgi by mistake. Therefore Django was unable to start a new thread to send email.

Error log was not so clear and it is not so clear why some emails were sent and some were not but nevermind.

from django-anymail.