Works On

Viewing:

Debian 9 (Stretch)

Same on:

Debian 10 (Buster) Debian 11 (Bullseye) Ubuntu 18.04 LTS (Bionic Beaver) Ubuntu 20.04 LTS (Focal Fossa)

Other versions:

Debian 12 (Bookworm) Debian 13 (Trixie) Ubuntu 22.04 LTS (Jammy Jellyfish) Ubuntu 24.04 LTS (Noble Numbat) CentOS Stream 9 Red Hat Enterprise Linux 8 (Ootpa) Red Hat Enterprise Linux 9 (Plow)

Details

Size: 13 lines
MD5: 0511e63a7d5f3a12406f8a2f7f8d2411
SHA256: 1494e8344f8ecc2986cfd8c8398a5be7a100c703e6a6469802aa903a85964d77

/etc/systemd/postfix.service

[Unit]
Description=Postfix Mail Transport Agent
Conflicts=sendmail.service exim4.service
ConditionPathExists=/etc/postfix/main.cf

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/true
ExecReload=/bin/true

[Install]
WantedBy=multi-user.target

Copy & Paste

curl:

curl https://exampleconfig.com/api/v1/config/original/0511e63a7d5f3a12406f8a2f7f8d2411?hint=postfix.service

wget:

wget -O postfix.service https://exampleconfig.com/api/v1/config/original/0511e63a7d5f3a12406f8a2f7f8d2411?hint=postfix.service

For AI Agents

<prompt><role>DevOps agent</role><source url='https://exampleconfig.com/api/v1/config/original/0511e63a7d5f3a12406f8a2f7f8d2411?hint=postfix.service' /><config><app>Postfix</app><os>Debian 9 (Stretch)</os><location>/etc/systemd/postfix.service</location><lines>13</lines><md5>0511e63a7d5f3a12406f8a2f7f8d2411</md5><sha256>1494e8344f8ecc2986cfd8c8398a5be7a100c703e6a6469802aa903a85964d77</sha256></config></prompt>

Paste into Claude, ChatGPT, or any AI assistant.

Install Postfix

Alpine Linux

sudo apk add postfix

Debian

sudo apt update && sudo apt install postfix

Red Hat Enterprise Linux

sudo yum install postfix

Ubuntu

sudo apt update && sudo apt install postfix

File Location

File Path

/etc/systemd/postfix.service

FAQ

When should I use this postfix.service?

Use it to restore a missing default, confirm what shipped, or diff against your current Postfix config.

How do I restore Postfix defaults?

Download the file, back up the current one in /etc/systemd/postfix.service, replace it, then reload or restart Postfix.

Is postfix.service safe for production?

It is the vendor default for Debian 9 (Stretch). Treat it as a baseline and review security and performance settings before production use.

How does this differ from other OS versions?

Defaults vary by distro and version. This copy matches Debian 9 (Stretch).

Can I use this for Postfix troubleshooting?

Yes. Diff it against yours to find drift, then restore only the sections you need.

Postfix /etc/systemd/postfix.service