```
If urllib2.urlopen throws an exception, you need to figure out why.
Does
```
wget https://publicsuffix.org/list/public_suffix_list.dat
```
retrieve the data?
After posting the message to this list I checked if the mailman server
could resolve https://publicsuffix.org and it failed thus for our
incident it was related to a firewall rule that allowed outbound 443
traffic being revoked which caused the delay in delivering and build up
of posts. After the rule was added back the spooled mailman posts in the
"in" directory were delivered within minutes.
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