Nodemailer "sendmail" transport is case sensitive: change in behavior

[lexpierce]

https://github.com/nodemailer/nodemailer/tree/0.7#setting-up-sendmail

As you can see, they use an all lowercase "sendmail" in the definition. I have used this for all my ghost installs until I moved to 1.0.0 release (1.0.3 specifically). Apparently Ghost-CLI now does validation that expects "Sendmail" and rejects "sendmail". There is nothing on the nodemailer github page that dictates case, and "sendmail" worked with older ghost, other nodemailer instances I have used, and all of the alpha/beta/RC instances of Ghost I ran (pre 1.0 Ghost-CLI).

Looking at https://github.com/nodemailer/nodemailer/blob/0.7/lib/transport.js they use toUpper to compare transport settings anyway.