Thank you in advance.
I briefly enabled twilio just to see what it was about, then I disabled it and set the IM back to default 'no im driver found'message. I know twilio is an SMS service, not email, but when I do test orders no emails came through to either customer or admin (the order went through ok in the store though), and it came up with an immediate 'critical error' notice, as follows:
Cannot send notification. Communication driver default_twilio is disabled!
Trace: #0 /home/www/domainname/core/lib/im.php on line 335 #1
/home/www/domainname/storefront/model/account/customer.php on line 190 #2 /home/www/domainname/extensions/fast_checkout/storefront/model/extension/fast_checkout.php on line 62 #3 /home/www/domainname/extensions/fast_checkout/storefront/controller/responses/checkout/pay.php on line 1072 #4 /home/www/domainname/extensions/fast_checkout/storefront/controller/responses/checkout/pay.php on line 954
I don't want twilio, so I deleted it entirely but it hasn't stopped the error (also cleared cache).
My mail settings are correct - I just use the default mail (not smtp) and I have a working email address attached to the store. It is not sending the customer email or the admin emails. I do think it's related to that extension, as it calls it the 'default communication'. Even though I disabled it (which should have reversed any changes twilio made) and then went on to delete it after receiving errors, it must have overrode a file somewhere.