SmtpSend4

-s servername	DNS server name (autodetect by default)
-p portnumber	port number for SMTP (default is 25)
-o outputfile	filename for messages (default is stdout)
-dial	dial before mail sending
-z	serialize SMTPSEND sessions
-b	daemon mode (do not exit; loop on mail\out\ folder)
-r	number of days to keep send trying; return if older
-ir	immediately return message on any errors
-rd	folder for returned mail (default 'mail\spool\')
-ra	MAILFROM for returned mail (default 'postmaster@local')
-debug	debug mode (DNS dump)
-v	validate only mode (without 'DATA' SMTPcommand)
-f foldername	set folder name (default 'mail\out\')
-sm	use specified SMTP server instead MX
-to	SMTP timeout in seconds (default is 10min)
-dmto	daemon mode tick interval
-pd	print current default DNS-server of TCP/IP stack
-dc	disable DNS checking
-ld	loop detect (equal MAIL FROM and RCPT TO)
-helo name	use specified name instead of domain in HELO command
-ehlo	use EHLO instead of HELO
-u	username, if ESMTP AUTH required by ISP
-w	password, if ESMTP AUTH required by ISP
-delay ms	delay 'ms' milliseconds after each send operation to slow down sending
-ini inifile	filename with global options (default is: {Eserv}\Eserv[.orig].ini, {ModuleDirName}\smtpsend4.ini)
-rh hours	move to retry folder, if can't post within 'hours' (default is 4 hr)
-rf retryfolder	retry folder name (default is mail\retry\)
-rn notifyfile	template of notification message for -rh (default is built-in template)
-s3	send to 'A' host when 'MX's not accepting message (default — use 'A' only if there no 'MX's at all)
-sh isp_server	use this server if MX- and A- delivery failed
-dw	disable icon and log-window creating
-ln number	limit number of lines in the listbox window (default is 30000)

SmtpSend4 включен в состав Eserv, начиная с версии 3.

В версии 4.27 добавлена поддержка SSL-соединений (вдобавок к давно поддерживаемым TLS). Пример: