BuildSMTPAddress returns the SMTP address string.

checkEnvironment checks the environment and returns a boolean value.

ExecSendMail sends an email using the provided SMTP server address, authentication, sender and recipient addresses, and message.

MountAndSendMail sends an email using the provided SMTP configuration.

SaveConfig saves the SMTP configuration to the database.

SaveLog saves the SMTP configuration to the database.

SetupInitAuth returns an smtp.Auth implementation using plain authentication.