Note HTML is not sanitized from text/plain content
Clarify that using a subdomain will affect your domain rep

Say your primary domain is example.com. Using mail.example.com as the (sub)domain to send mail from will still affect your primary domain reputation, as it's the same domain.

I was unsure about this but Nick Schafer from Mailgun support cleared it up, so all credit goes to him!
Fixed coding style, some inconsistencies and unused variables in PHP examples
Merge pull request #52 from dideler/patch-1

Clarify that using a subdomain will affect your domain rep
Merge branch 'clarify_message_plain_text_fields' of https://github.com/ilikepi/documentation into ilikepi-clarify_message_plain_text_fields
Fixed table issue on build. Reference #37.
Merge pull request #68 from travelton/ilikepi-clarify_message_plain_text_fields

Ilikepi clarify message plain text fields
Merge pull request #58 from perajovic/master

Fixed PHP examples