Simplenews works excellent, except from field in received newsletter mail appears to be broken.

Example:

"\"NEWSLETTER sender name\" <noreply@domain.com>"@domain.com

is what i get in from name.

Also, in some clients:

"=?UTF-8?B?IlBST0ZJTCDFoWtvbHNraSBwb3J0YWwiIDxub3JlcGx5QHByb2ZpbC5ocj4=?="@domain.com

I suspect that it might be server side related, but in any case please advise what could cause this ?
Server side software is Postfix on Debian.

On the other side, other modules operates ok, regarding from field (Drupal generic mail for administrator that sends e-mail about upgrades looks ok)

Thanks for help!