---
name: "mprobe"
section: "8"
platform: "linux"
package: "zmailer"
version: "2.99.55-3"
release: "Debian 3.0 (Woody)"
platforms: ["linux"]
url: "https://new.carta.tech/mprobe"
---

# mprobe(8)

smtp-server aliveness probe

## NAME

mprobe - smtp-server aliveness probe

## SYNOPSIS

**mprobe** *hostname*

## DESCRIPTION

*mprobe* is usable to test, if the named host (no IP address usable!) has a smtp-server that responds properly.

## EXIT CODES

- 0

  All is well, smtp-server responded just fine

- 2

  Can't resolve target hostname

- 3

  **mprobe** internal failure, can't create socket (should not happen!)

- 4

  failed to connect to the remote host

- 5

  **mprobe** internal failure, fdopen() failed.. (should not happen!)

- 17, 19

  The remote smtp-server hung-up on us, most likely

- 18

  The remote smtp-server did respond something, but it did not begin with "220"

- 20

  Timeout (60 seconds) from start of processing.

- 99

  Missing mandatory host parameter.

## SEE ALSO

[scheduler(8)](/scheduler/8.md), [smtpserver(8)](/smtpserver/8.md), [smtp(8)](/smtp/8.md)

## AUTHOR

This tool is authored and copyright by: Matti Aarnio \<mea@nic.funet.fi\>