• I have multiple companies and some users who can access many of them.  

• Users are following mail threads from different companies at once.

• When there is an email sent inside Company A it has an URL leading to a record inside that Company A.

• And if user clicks on that URL and has current company set as Company B he is forwarded to a discussion page without any information what happened.

How do I change that behavior?

I would like to show at least pop-up saying that user should change its current company. Or even better if it would change automatically.