OCR of scanned PDFs via IMAP/SMTP

This small project scans an IMAP folder for new messages and converts every attached PDF via ocrmypdf.

For multiple users, the IMAP-Folder may be used with user+sub-addresses like:

• scanner+user1@example.org
• scanner+user2@example.org

in the configuration file /app/resources/config.properties, these can be used to define new target addresses for the ocr-ed PDFs:

fwd.scanner+user1@example.org=real-user1@example.org
fwd.scanner+user2@example.org=real-user2@example.org

WARNING: This tool deletes every mail in the inbox after processing (if possible). So please use a dedicated imap-account for this.

Running:

The docker image is available via docker.hub.

docker run --rm \
  -v PATH_TO_LOCAL_CONFIG/config.properties:/app/resources/config.properties \
  wjung/imap-pdf-ocr:latest

The optional environment variable PDF_QUALITY can be use to rescale the result pdf. ( See https://tex.stackexchange.com/questions/6121/presentation-option-screen-or-prepress-in-ps2pdf#6127). Defaults to /ebook.

If set to none, no downsampling will occur.

Sample config:

# see https://javaee.github.io/javamail/docs/api/com/sun/mail/imap/package-summary.html
mail.imap.user=scanner
mail.imap.host=imap.example.org
mail.imap.port=143
mail.imap.ssl.enable=false
mail.imap.starttls.enable=true
mail.imap.starttls.required=true

mail.event.scope=session
mail.imap.usesocketchannels=true
mail.imaps.usesocketchannels=true


# see https://javaee.github.io/javamail/docs/api/com/sun/mail/smtp/package-summary.html
mail.smtp.user=scanner
mail.smtp.host=smtp.example.org
mail.smtp.port=587
mail.smtp.from="Scanner" <scanner@example.org>
mail.smtp.auth=true
mail.smtp.ssl.enable=false
mail.smtp.starttls.enable=true
mail.smtp.starttls.required=true

# Passwords
mail.imap.pass=xxx
mail.smtp.pass=xxxx

# Forwards
fwd.default=user@example.org
fwd.scanner+user1@example.org=user1@example.org
fwd.scanner+user2@example.org=user2@example.org

# Language
ocr.lang=deu

# delete messages after processing
deleteAfterProcessing=true