---
sourceDocument: Australia ServiceNow AI Platform Administration
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/platform-administration

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia ServiceNow AI Platform Administration

ft:clusterId :

    - platadm

bundleId :

    - platadm

workflow :

    - Platform


---

# Attachment

# Attachment limit properties {#ariaid-title1}

Release version: Australia  
Updated March 12, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 3 minutes to read
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## Summary of Attachment Limit Properties

This document outlines the properties that control email attachment limits within ServiceNow, specifically for inbound and outbound emails.
Understanding these settings is crucial for maintaining optimal system performance and ensuring successful email operations.
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## Key Features

* **Inbound Email Attachment Limits:**
  * **Maximum Attachment Count:** Defined by `glide.email.inbound.maxattachmentcount` (default: 30).
  * **Maximum Total Attachment Size:** Defined by `glide.email.inbound.maxtotalattachmentsizebytes` (default: 18,874,368 bytes).
* **Outbound Email Attachment Limits:**
  * **Maximum Attachment Count:** Defined by `glide.email.outbound.maxattachmentcount` (default: 30).
  * **Maximum Total Attachment Size:** Defined by `glide.email.outbound.maxtotalattachmentsizebytes` (default: 18,874,368 bytes).
* **Attachment Size Control:** The property `com.glide.attachment.maxsize` sets the maximum file size for any attachment, overriding the email-specific limits.

## Key Outcomes

For inbound emails, if attachments exceed the specified limits, they are discarded, and a record of the discarded file is created. Users can configure notifications for discarded attachments.

For outbound emails, if the limits are exceeded, the email will be sent with only the allowed number or size of attachments, and a warning will be logged. This also applies to notifications, scheduled reports, and exported records to ensure email delivery without exceeding limits.  
Several properties control email attachment limits.
To see the status of all email attachments, go to the Email Attachments \[sys_email_attachment\] table.

## Properties

All the properties are located in the System Property \[sys_properties\] table. Setting any
of the following properties to an excessively large value may cause performance issues.  
{#r_AttachmentLimitProperties__table_lft_wmt_gr__entry__2}

| Name | Description |
|-|-|
| glide.email.inbound.max_attachment_count | Sets the maximum number of attachments allowed per inbound email. * Type: integer * Default value: 30 * Learn more: Inbound Email Attachment Processing {#r_AttachmentLimitProperties__ul_vzt_jnt_gr} |
| glide.email.inbound.max_total_attachment_size_bytes | Sets the maximum total attachment size in bytes allowed per inbound email. * Type: integer * Default value: 18874368 * Learn more: Inbound Email Attachment Processing {#r_AttachmentLimitProperties__ul_bkz_nnt_gr} |
| glide.email.outbound.max_attachment_count | Sets the maximum number of attachments allowed per outbound email. * Type: integer * Default value: 30 * Learn more: Outbound Email Attachment Processing {#r_AttachmentLimitProperties__ul_uzh_4nt_gr} |
| glide.email.outbound.max_total_attachment_size_bytes | Sets the maximum total attachment size in bytes allowed per outbound email. To send an email, the system must encode the contents of the email. This process may significantly increase the size of the email, including any attachments. It is best to set this property to a value well below the maximum email size. * Type: integer * Default value: 18874368 * Learn more: Outbound Email Attachment Processing {#r_AttachmentLimitProperties__ul_obp_4nt_gr} |
[Table 1. Attachment limit properties]

{#r_AttachmentLimitProperties__table_lft_wmt_gr}  
Note:  
A different property, com.glide.attachment.max_size, sets the maximum file size allowed for any attachment in the system and overrides any larger values of glide.email.inbound.max_total_attachment_size_bytes and glide.email.outbound.max_total_attachment_size_bytes.

## Inbound email attachment processing

For inbound emails, the system enforces the maximum number and size of attachments as set
by the glide.email.inbound.max_attachment_count and
glide.email.inbound.max_total_attachment_size_bytes properties. When
an attachment for an inbound email exceeds either value, the attachment is discarded. A record is created in the Email Attachments \[sys_email_attachment\] table containing the discarded file name and the reason it was discarded. The discarded file remains in the Email \[sys_email\] record. The order in which the system processes the attachments determines which attachments are
discarded. This order may not be consistent from email to email.

When an inbound email attachment is discarded, the system also fires the
inbound.email_attachments.discarded event. You can use the event to
trigger a notification that alerts the email sender. For an example of a notification that
can be triggered by the event, see the inactive "Demo Email Attachment(s) Discarded"
notification.

Inbound email attachments are prevented from attaching to the target record if an identical
attachment exists.

## Outbound email attachment processing

For outbound emails, the system enforces the maximum number and size of attachments as set
by the glide.email.outbound.max_attachment_count and
glide.email.outbound.max_total_attachment_size_bytes properties.
Email records are created from various sources and may exceed the configured attachment
limits.

Emails that are ready to be sent from the Email \[sys_email\] table are subject to the
outbound attachment limits. Emails that exceed either limit trigger a warning in the email
system log and are sent with attachments up to the maximum number or total file size.

The log message for such an email might look like this: Maximum combined attachment size exceeded. (max:15728640 bytes). One or more attachment records ignored.

## Emails for notifications, scheduled reports, and exported tables

Notifications can be set to include all the attachments from the record that triggers the
notification. If the attachments exceed either of the outbound email attachment limits, the
system excludes the excess attachments from the email and logs a warning message.

Reports can be scheduled for email distribution as attachments. Large reports may exceed
the outbound attachment size limit. In this case, the system sends the scheduled report
email without the report attached and logs a warning message. To avoid the issue, send links
to large reports instead of sending the reports as attachments.

If a user attempts to export numerous records from a list that exceeds a configured warning
threshold, a dialog box offers the option to email the exported records as an attachment. If
the attachment exceeds the outbound attachment size limit, the system sends the email
without the exported record list attached and logs a warning message.