Published June 3, 2020 | Version v1
Dataset Restricted

Webis Gmane Email Corpus 2019

  • 1. Bauhaus-Universität Weimar
  • 2. Leipzig University


The Webis Gmane Email Corpus 2019 is a dataset of more than 153 million parsed and segmented emails crawled between February and May 2019 from covering more than 20 years of public mailing lists. The dataset has been published as a resource at ACL 2020.

The dataset comes as a set of Gzip-compressed files containing line-based JSON in the Elasticsearch bulk format. Each data record consists of two lines:

{"index": {"_id": "<urn:uuid:c1d95e4b-0f43-46c7-a99e-c575d1d8e1ce>"}}
{"headers": {"header name": "header value", ...}, "text_plain": "plaintext body", "lang": "en", "segments": [{"end": 99, "label": "paragraph", "begin": 0}, ...], "group": "gmane group name"}

The first line is the Elasticsearch index action with a document UUID, the second one the actual parsed email with a (reduced and anonymized) set of headers, the detected language, the original Gmane group name and the predicted content segments as character spans. The Gzip files are splittable every 1,000 records (line pairs) for parallel processing in, e.g., Hadoop.

Available email headers are:

  • message_id
  • date (yyyy-MM-dd HH:mm:ssZZ)
  • subject
  • from
  • to
  • cc
  • in_reply_to
  • references
  • list_id

Available segment classes are:

  • paragraph
  • closing
  • inline_headers
  • log_data
  • mua_signature
  • patch
  • personal_signature
  • quotation
  • quotation_marker
  • raw_code
  • salutation
  • section_heading
  • tabular
  • technical
  • visual_separator

Find more information about the dataset and the segmentation model at

If you are using this resource in your work, please cite it as:

  author =              {Janek Bevendorff and Khalid Al-Khatib and Martin Potthast and Benno Stein},
  booktitle =           {58th Annual Meeting of the Association for Computational Linguistics (ACL 2020)},
  month =               jul,
  publisher =           {Association for Computational Linguistics},
  site =                {Seattle, USA},
  title =               {{Crawling and Preprocessing Mailing Lists At Scale for Dialog Analysis}},
  year =                2020




The record is publicly accessible, but files are restricted to users with access.

Request access

If you would like to request access to these files, please fill out the form below.

You need to satisfy these conditions in order for this request to be accepted:

The dataset is available only to individual researchers and research institutions. If you qualify for either one, we are happy to share the data with you under the following conditions:

Any non-academic use and redistribution of the data are prohibited. By downloading the dataset, you agree to these terms. We request you be responsible in your research and in your handling of the data and adhere to ethical standards and privacy regulations.

Despite the anonymization of email addresses and headers and the fact that all data comes from a readily-available online source, we take this step as a measure to protect the privacy of users whose data can be found in the corpus.

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