---
name: "mtasim"
section: "1"
platform: "linux"
package: "mailfromd"
version: "9.0-1+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/mtasim"
---

# mtasim(1)

MTA simulator for mailfromd

## NAME

mtasim - MTA simulator for mailfromd

## SYNOPSIS

**mtasim** \[*OPTION*...\]

## DESCRIPTION

mtasim **--** MTA simulator for mailfromd

-

  Mode selection

- **-b** MODE

  set MTA mode (**-bd** or **-bs**)

- **--daemon**

  run as daemon (same as **-bd**)

- **-g**, **--group**=*NAME*

  retain the supplementary group NAME when switching to user privileges

- **--stdio**

  use the SMTP protocol on standard input and output (same as **-bs**)

- **-u**, **--user**=*NAME*

  run with this user privileges

-

  Operation modifiers

- **--body-chunk**=*NUMBER*

  set the body chunk for xxfi\_body calls

- **-D**, **--define**=*MACRO=VALUE*

  define Sendmail macro

- **--\[no-\]interactive**

  interactive mode

- **--milter-actions**=*BITMASK*

  force the given Milter actions

**--milter-proto**=*BITMASK* set Milter protocol capabilities

- **--milter-timeout**=*F=V\[*,F=V...\]

  set milter timeouts

- **--milter-version**=*VER*

  force using the given Milter protocol version number

- **--prompt**=*STRING*

  set readline prompt

- **--sender-sockaddr**=*FAMILY\[*,HOSTNAME,ADDRESS\[,PORT\]\]

  set sender socket address

- **--\[no-\]statedir**

  pass temporary directory to mailfromd as its state dir (with **-Xauto**)

- **-X**, **--port**=*PORT*

  communicate with Milter PORT

-

  Debugging and tracing

- **-a**, **--\[no-\]append**

  append to the trace file

- **--gacopyz-log**=*LEVEL*

  set Gacopyz log level

- **--trace-file**=*FILE*

  set name of the trace file

- **-v**, **--verbose**

  increase verbosity level

-

  Informational options

- **--show-config-options**

  show compilation options

- \-?, **--help**

  give this help list

- **--usage**

  give a short usage message

- **-V**, **--version**

  print program version

Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

## AUTHOR

Written by Sergey Poznyakoff.

## REPORTING BUGS

Report bugs to \<bug-mailfromd@gnu.org.ua\>. mailfromd home page: \<http://www.gnu.org.ua/software/mailfromd\>

## COPYRIGHT

Copyright © 2005-2023 Sergey Poznyakoff License GPLv3+: GNU GPL version 3 or later \<http://gnu.org/licenses/gpl.html\>\
 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

## SEE ALSO

The full documentation for **mtasim** is maintained as a Texinfo manual.  If the **info** and **mtasim** programs are properly installed at your site, the command

-

  **info mtasim**

should give you access to the complete manual.