---
name: "postsrsd"
section: "8"
platform: "linux"
package: "postsrsd"
version: "1.10-2.2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/postsrsd"
---

# postsrsd(8)

Postfix Sender Rewriting Scheme daemon

## NAME

postsrsd - Postfix Sender Rewriting Scheme daemon

## SYNOPSIS

**postsrsd** *-s\<file\> -d\<domain\>* \[*other options*\]

## DESCRIPTION

Sender Rewriting Scheme implementation for Postfix.

Implements two TCP lookup tables to rewrite mail addresses as needed. The forward SRS is for sender envelope addresses to prevent SPF-related bounces. The reverse SRS is for recipient envelope addresses so that bounced mails can be routed back to their original sender.

## OPTIONS

- **-s**\<file\>

  read secrets from file (required)

- **-d**\<domain\>

  set domain name for rewrite (required)

- **-a**\<char\>

  set first separator character which can be one of: -=+ (default: =)

- **-f**\<port\>

  set port for the forward SRS lookup (default: 10001)

- **-r**\<port\>

  set port for the reverse SRS lookup (default: 10002)

- **-p**\<pidfile\>

  write process ID to pidfile (default: none)

- **-c**\<dir\>

  chroot to \<dir\> (default: none)

- **-u**\<user\>

  switch user id after port bind (default: none)

- **-t**\<seconds\>

  timeout for idle client connections (default: 1800)

- **-X**\<domain\>

  exclude additional domain from address rewriting

- **-e**

  attempt to read above parameters from environment

- **-D**

  fork into background

- **-4**

  force IPv4 socket (default: any)

- **-6**

  force IPv6 socket (default: any)

- **-h**

  show usage information

- **-v**

  show version