Customers not getting coupon

Dear Sir/madam,

We are using awocoupon in combination with one page checkout. Our customers are getting a gift certificate e-mail after they placed a purchase and paid for it (and status changes to Confirmed). We (admin) - in BCC are always getting a copy of the gift certificate e-mail, but we are getting loads of complaints that the e-mail to the customer did not sent.

How could it possibly be that we are always receiving the e-mail and our customers not (always)??

Cheers,

Sander

Edit: It seems to be that only customers who are using a 'free' email provider (gmail, hotmail, live, outlook) are not receiving the gift certificate e-mails. Do you know how to solve this?

Thanks in advance!
Sander

Hello,

I am not sure what is cuasing that. Have you checked to make sure your domain is not on a email blacklist? Do the customers receive other emails, like order confirmation?

Hi Seyi,

The order confirmations are being sent, just checked it.

Cheers,

Sander

Ok, so if you go to awocoupon->history of uses->orders and resend, still the customer does not receive it?