text: Wow, that is really vague.  There could be a number of reasons.  I would need to know particulars such as, are they being rejected back to you?  If so, I would need to know the error you're getting when they are being rejected by her email client.\n\nCould be anything simple from her email address not being typed correctly to your email being blacklisted by her email server itself.  \n\nProvide a bit more info so we can help.