I create system where my Reply-To field in mails header is different than 'From' field. It contains an array with few mails. 

So when i click 'Reply to All' it should use all mails from array, but Zoho takes only first one. It does work properly on gmail though. 

I use Swift Mailer to send mails form the server and i set up ReplyTo field with  ->setReplyTo($mailArray)

Can you give me any tips how to solve this problem?

cheers

Peter