When i edit e.g. Store Hours of Operation in Configuration->General>General the key is edit/section/general/key/2782d337122c35624f77cab76da7c5d1/
in browser console when 1 save changes Navigate to this same key edit/section/general/key/2782d337122c35624f77cab76da7c5d1/
But when i wont change configuration in Configuration->Sales->Sales Email the key is edit/section/sales_email/key/2782d337122c35624f77cab76da7c5d1/
but on save Navigated to index.php/admin/system_config/save/section/sales_email/key/02067e1f92ae2f95912d61be5f906a2f and display 402 (Payment Required)_submit @ form.js:108submit @ form.js:68onclick @ (index):899
When I uninstall Fooman_EmailAttachments extension I can save configuration bae noe order emails still not sending...
Thanks for using our extension.
It sounds like there are a couple of issue you are trying to work through:
Emails are not being sent. This issue seems to exist irrespective of our extension installed or not so is very likely not related to our extension code. One thing to note which gets overlooked a lot is that Order confirmation emails in Magento 1.9. are only sent when you have an active and working Magento cron job - see these instructions here http://devdocs.magento.com/guides/m1x/install/installing_install.html#install-cron
One thing we did come across in the past is that our extension adds lots of options to a settings page which already has quite a few options. This can result in the final request being sent to the server hitting a limitation on the php POST. I'd suggest taking a look (or get your host/sysadmin) at the following post_max_size and max_input_vars (also check if restricted via suhosin).