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config.go

This file initializes the mailer with the required constants. Viper is used to get the constants from _config.yml and the secrets file. Logrus is used to log the status.

Following constants are initialized

  • user
  • sender : user + “@iitk.ac.in”
  • pass : password
  • host
  • port
  • webteam : email address of the web-team

user, password, webteam are defined in the secrets file.

service.go

This file defines methods to build messages.

Mail struct is defined with the standard mailing properties.

  • To
  • Subject
  • Body

Function BuildMessage

This method builds the message by setting the From, Subject, To and Signature properties of the body of the mail and returns the final body.

Read the code here

All the recipients are put into BCC when the message is mass mailed.

Function Service

This is the function started in cmd as a Go routine for sending mails. The function receives the mail queue channel, builds the message of the mail using BuildMessage function and sends the mail using the SMTP protocol.

Errors are logged by logrus.

The mail is forwarded to the webteam mail as well

generate.go

This file takes all the properties of the mail and generates the final object of type Mail to be sent using the SMTP protocol.

  • Function GenerateMail - to generate a single mail
  • Function GenerateMails - to generate multiple mails

References