pub fn new(from: Email) -> Message {
        Message {
            from,
            subject: String::new(),
            personalizations: Vec::new(),
            content: None,
            attachments: None,
            template_id: None,
        }
    }
/// Construct a new V3 message.
Construct a new V3 message.
Construct a new V3 message .
pub fn new(from: Email) -> Message {
        Message {
            from,
            subject: String::new(),
            personalizations: Vec::new(),
            content: None,
            attachments: None,
            template_id: None,
        }
    }
pub fn new ( from : Email ) -> Message { Message { from , subject : String :: new ( ) , personalizations : Vec :: new ( ) , content : None , attachments : None , template_id : None , } }
Construct a new V3 message.
Construct a new V3 message .
from
Email
from
Email