What is a good free or very cheap e-mail forwarding service?

I am working with someone who is in recovery from a life of abuse. Her current e-mail address is not a good identity for her (it sends a very negative message). She wants to have the e-mail from the old one forwarded to a new one.

She prefers a free forwarding service for e-mail, but she is willing to pay if it’s not too much. She doesn’t want a new e-mail account, just a service that forwards from one free e-mail account to another. She needs to know the parameters (limit of e-mails per day, MB allowed per e-mail, etc.)

We live in the USA, if that helps.
Thanks!