Validation on Reply-To Email Based on Incoming Email Address

[IshitaRana]

Hi,

I’m trying to implement a custom validation on the reply functionality.


When replying to an incoming email, I want to restrict the selectable "From" email addresses based on the sender of the original email. Example:

• If the incoming email is from abc@gmail.com, then the reply should only be sent from def@gmail.com.
• If the user selects a different reply-from address (e.g., ghi@gmail.com), it should throw an error and prevent sending the email.
• This validation should support multiple such mappings, like:
  • abc@gmail.com → only allow reply from def@gmail.com
  • xyz@domain.com → only allow reply from noreply@domain.com
• What’s the best way to implement this kind of validation in EspoCRM?

[yuri]

Hello,

It's possible to use API Before Save Script for the Email entity type. https://docs.espocrm.com/administrat...e-save-script/

The formula script could check certain fields and throw an error with a custom message.