deepjs wrapper for nodemailer and postmark.
For transporter config parameters see nodemailer docs.
// configure default transporter;//....deep;//...;
You could use deep.context to manage contextualised transporter.
deep.mail will first look after a 'deep-mail-transporter' property in deep.context before trying to use the default (general) one.
see deepjs docs on concurrent context management to fully grasp the utility of such manipulation
full API :