Mail

Sending mail with sendmail

sendmail -t < <messagefile>

Send the email as in <messagefile>

The email headers are in <messagefile>. That should look like:

From: me@mydomain.tld
To: user@domain.tld
Subject: Subject of your mail
email text

mailx -s Subject -a <attachmentfile> email@domain.tld

Send email with attachment after entering optional text and an EOT (CTRL-D).

Python email sender found in [python docs]

def main():
    attachement1 = filepath
    attachement2 = filepath
    maxmailsize = 10000000
    mailto = ['you@domain.tld']
    mailcc =  ''
    mailbcc = ['secret@domain.tld']     # Only include this in the final sendmail call, not in the headers.
    mailfrom = 'me@domain.tld'          # Some system do not like this, just remove it from the sendmail call
    mailsubject = 'What this is about'
    mailtext = "Hi,\n\nI'd like to send you an email.\n\nBest Regards\n\nMe."
    sendmail(mailto, mailcc=mailcc, mailbcc=mailbcc mailfrom=mailfrom, mailsubject=mailsubject, mailtext=mailtext, attachments=[attachment1,attachment2])
    return
 
 
def sendmail(mailto,mailcc = '',mailbcc = '',mailfrom = '',mailsubject = '',mailtext = '',attachments = ''):
    import smtplib
    from email import encoders
    from email.message import Message
    from email.mime.base import MIMEBase
    from email.mime.multipart import MIMEMultipart
    from email.mime.text import MIMEText

    outer = MIMEMultipart()
    outer['Subject'] = mailsubject
    outer['To'] = ",".join(mailto)
    outer['CC'] = ",".join(mailcc)
    if mailfrom != '':
        outer['From'] = mailfrom
    msg = MIMEText(mailtext,_subtype='plain')
    outer.attach(msg)
    if attachments != '':
        attachtotsize = 0
        for attachment in attachments:
            attachsize = os.stat(attachment).st_size
            if  attachtotsize + attachsize > maxmailsize:
                mailtext += attachment+" makes the message bigger than "+maxmailsize+", it is not attached.\n"
            else:
                attachtotsize += attachsize
                filename = attachment.split('/')[-1]
                ctype = 'application/octet-stream'
                maintype, subtype = ctype.split('/', 1)
                fp = open(attachment, 'rb')
                msg = MIMEBase(maintype, subtype)
                msg.set_payload(fp.read())
                fp.close()
                # Encode the payload using Base64
                encoders.encode_base64(msg)
                # Set the filename parameter
                msg.add_header('Content-Disposition', 'attachment', filename=filename)
                outer.attach(msg)
    composed = outer.as_string()
    s = smtplib.SMTP('localhost')
    s.sendmail(mailfrom, mailto+list(mailcc)+list(mailbcc) , composed)
    s.quit()
    return


main()