Works On

Viewing:

Ubuntu 18.04 LTS (Bionic Beaver)

Same on:

Debian 10 (Buster) Debian 11 (Bullseye) Debian 9 (Stretch) 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>Ubuntu 18.04 LTS (Bionic Beaver)</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 Ubuntu 18.04 LTS (Bionic Beaver). 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 Ubuntu 18.04 LTS (Bionic Beaver).

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