Sendgrid
Sendgrid is great but takes some fiddling.
Configuration
Email Template
I am using a Dynamic Template from here.
I am building it from HTML snippets in Reusable, here:
development/Reusable/HTML_CSS/basicEmailHtml_header.html
[Domain Authentication]
Go here to set up DNS records to authenticate your domain.
You will have to add something like 5 CNAME and 1 TXT DNS records, all kinda ugly. Just do it!
Repeat if you change registrars!