I want to get a welcome email with coupon code in magento when a new customer is registered. Please tell me what I can do. I am using this link: https://magento.stackexchange.com/questions/79927/adding-custom-generated-coupon-code-from-observer-to-new-account-email-template
What i would suggest is to use transactional emails and enter your coupon code as plain text. This removes any code level dependency if the coupon changes time and again.