Filter Creation Character Limit

Situation – Trying to add a list of addresses to a filter and it will not save. Is there a character limit?
Solution – Creating/Editing a filter has a character limit of 5000 characters.

Filter Limits

When creating or editing a filter and it does not save, this is probably due to the character limit. Filters have a limit of 5000 characters.
If you are adding a list of addresses or CIDR ranges to a filter, it would be best to use the Sender Lists. These do not have a character limit.

This can be found under ‘Security Settings’ > Email > Sender Lists

Sender Lists

Further reading:

Setting Up Sender Lists

Whitelisting Addresses