Jegs

Hi guys I'm new here! so sorry if this is off topic. I search teh forum if this thread was previously treated, but I didn't find anything. The question is very simple. I'm sending mails throught php with the mail function, and using a plain text file to store the addresses that users have suscribed. The text file has a simple format just like: User1 <user1@domain.com>, User2 <user2@domain.com> The php, reads the text file and associates it whole content to a variable called $to used to send the mail after. The previous formats works ok, but: If for example a user wants to register two addresses how should I format it in the text file. I have tried this: User3 <user3_address1@domain.com, user3_address2@domain.com> but It doesn't work. Anyone could help please :D Best regards Javier