Support Article

Email listener performing slow for big size emails



Delay in processing of large attachment through email listener.

Error Messages

Not Applicable

Steps to Reproduce

1) Configure an email listener.
2) Ensure that below configuration is set:
mail.imap.partialfetch = True
3) Send emails with large attachment.

Root Cause

A defect or configuration problem in the operating environment:

The issue is caused by IMAP Partial Fetch functionality.

Partial fetch functionality fetches attachment in batches of 16 KB chunks each.

10 MB file would require more than 500 fetches to complete the download, which would causes delay.


Add the following setting to Email Account receiver key properties as : mail.imap.partialfetch = false

Published February 8, 2017 - Updated February 19, 2017

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