fix SMTP mail sender

Now getting:

Jun  9 07:46:15 mail postfix/smtpd[39731]: improper command pipelining after HELO from webserver.internal[10.0.143.12]: MAIL FROM: <syncd@indigo>\r\nRCPT TO: <bvgastel@bitpowder.com>\r\nDATA\r\nFrom: "Indigo syncd" <syncd@indi

Apparently command pipelining is an SMTP extension, that is only available after the HELO. See https://www.spamstopshere.com/blog/system-administration/smtp-pipelining#:~:text=Command%20pipelining%20is%20an%20extension,a%20response%20to%20each%20one.&text=The%20server%20then%20responds%20to%20each%20command%20individually.

Make the SMTP protocol work in two steps.