fix: mail url collector: import requests Timeout exception

fixes certtools#2555

CHANGELOG.md

@@ -23,6 +23,7 @@
 - `intelmq.bots.collectors.shadowserver.collector_reports_api.py`:
   - Fixed behaviour if parameter `types` value is empty string, behave the same way as not set, not like no type.
 - `intelmq.bots.collectors.misp`: Use `PyMISP` class instead of deprecated `ExpandedPyMISP` (PR#2532 by Radek Vyhnal)
+- `intelmq.bots.collectors.mail.collector_mail_url`: Fix import for Timeout exception preventing another exception (fixes #2555, PR#2556 by Sebastian Wagner).
 
 #### Parsers
 - `intelmq.bots.parsers.shadowserver._config`:

intelmq/bots/collectors/mail/collector_mail_url.py

@@ -8,6 +8,7 @@
 """
 import io
 import re
+from requests.exceptions import Timeout
 
 from intelmq.lib.mixins import HttpMixin
 from intelmq.lib.splitreports import generate_reports
@@ -50,7 +51,7 @@ def process_message(self, uid, message):
                 self.logger.info("Downloading report from %r.", url)
                 try:
                     resp = self.http_get(url)
-                except requests.exceptions.Timeout:
+                except Timeout:
                     self.logger.error("Request timed out %i times in a row." %
                                       self.http_timeout_max_tries)
                     erroneous = True