"Send mail as" replies not working

"Send mail as" replies not working

When i get a 2nd response after sending an email using an alternative email address as set up in the "send mail as" section, the mail goes to my main address, and not to the one i chose as "send mail as".

Here is an example of the problem:

My main address is paula@mycompany.com
The address i configured as "send mail as" is info@mycompany.com

1. I send an email from my main account, and i chose info@mycompany.com in the "from" field, and info@mycompany.com in the "reply to" field.

2. When the person replies, the email arrives to info@mycompany.com as expected.

3.Then I answer back again that email and it shows to the recipient that the email was sent from info@mycompany.com, everything perfect for now.

4. But here comes the problem, when the person replies back again for a second time, now this email arrives to my original address paula@mycompany.com, and not to info@mycompany.com!!

So, to sum up, whenever i have a conversation of more than two replies, the address i chose as "send as" and "reply to" doesn`t work any longer!

Until yesterday, every time i wanted to reply i could chose the option "reply to", but now that option is only availiable when i start a convo.