gaierror: [Errno -2] Google Cloud Functions 中 imaplib.IMAP4_SSL 未知的名称或服务

Question

I have a perfectly fine script that works fine when I run it locally to authenticate using IMAP4_SSL and imaplib as follows:

mail = imaplib.IMAP4_SSL(host_incoming, port_incoming)
mail.login(user, password)
mail.list()

However, when I host this part of the code in the Google Cloud Functions, then I receive the error:

gaierror: [Errno -2] Name or service not known getaddrinfo (/opt/python3.7/lib/python3.7/socket.py)

If I use Google Gmail credentials instead (for host, port, user and password), then no errors are provided and everything works fine. So what is wrong with the email or server that I am using and how could I check this?

Answer 1

Have you added a billing account for your the project containing your Cloud Function? Functions on the free tier cannot communicate with external networks and will fail DNS lookup.