Gmail settings size limits

As an administrator, you configure Gmail settings, such as compliance, routing, objectionable content, quarantines, and more. To keep Gmail running efficiently and avoid email delivery delays, make sure your Gmail settings stay within the following recommended size limits.

Recommended limits

These limits are for your entire Google Workspace account: all your organizational units and domains combined. 

Setting description	Google Workspace account limit	Learn more about these settings
Settings: The size limit for all Gmail settings, such as Spam, Compliance, and Routing settings.	5 MB. This limit is the combined size of all Gmail settings in your Google Workspace account, after you save them and they’re compiled by the system. If you reach this limit, you can’t save additional settings.  1,000 settings (not over 5 MB).	Spam filters Content compliance Email routing
Descriptions: The number of characters that can be used to describe settings, regular expressions, and other items.	1,000 characters per description	Spam filters Content compliance Email routing
Regular expressions: The guidelines for simple-match and advanced-match regular expressions.	1,000 expressions 4,000 characters per expression	Content compliance
Recipients: The number of recipients in the Also deliver to setting.	100 recipients	Content compliance Email routing
Objectionable words: The number of words in the Objectionable content setting.	100,000 entries	Objectionable content
Email addresses: The number of addresses for:  Approved and blocked senders.  Apply or bypass lists, which are lists that are used to apply settings to specific addresses or bypass settings for specific addresses.	2,000 address lists  100,000 addresses per list	Blocked senders Spam filters Content compliance
Email address maps: The guidelines for recipient address maps or alias tables.	5,000 entries per map	​Email routing
S/MIME certificates: The number of S/MIME root certificates.	100 root certificates	​S/MIME
Email quarantines: The number of email quarantines.	21 quarantines	Email quarantines
Attachments: Depends on several factors and ranges from 25 MB for outgoing mail to 150 MB for inbound mail to @google.com addresses.