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Lightweight SMTP Relay on Raspberry Pi Zero W

This can provide a simple local SMTP relay.

A typical use case would be somewhat older devices (like security cameras) that cannot handle TLS while sending e-mails, but your very friendly e-mail provider now insists on that.

The Raspberry Pi Zero W typically consumes about 100..150mA at the USB power connection (less than 0.8W) and can e.g. be powered by the USB port of a router, like the AVM Fritz!Box. (Of course, if you were willing to run a custom firmware on that router, you could directly run the SMTP relay there...)

Initial setup of the Raspberry Pi Zero W:

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How I successfully rooted an Oukitel WP12 Pro Android 11 phone:

• Follow the usual steps to become developer and unlock the bootloader in the developer settings
• Download the original ROM image from https://oukitel.com/pages/download-center --> https://mega.nz/file/dswHQCxa#9ea1Cstdw_mC3ucVfprv3LBY7UtKL09xpS2kTqLUE2M
• Use latest Magisk (https://github.com/topjohnwu/Magisk/releases) to modify boot.img, which created magisk_patched-24305_0Hd3C.img
• Use instructions from https://forum.xda-developers.com/t/oukitel-wp12-magisk-root-bootloop.4310443/ (slightly modified): in the unzipped ROM image directory, do

fastboot flashing unlock
fastboot flash boot_a magisk_patched-24305_0Hd3C.img
fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img