| -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) |
