From 1a5c2ac496cf95eda4996b229cc55898c0283507 Mon Sep 17 00:00:00 2001
From: Christine Elisabeth Koppel <kuutruu@posteo.net>
Date: Mon, 16 Feb 2026 12:16:15 +0100
Subject: [PATCH] Change SMTP listener to bind on port 587 instead of 25... to
 circumvent the block.

---
 nix-system-configs/modules/system/mail-server.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nix-system-configs/modules/system/mail-server.nix b/nix-system-configs/modules/system/mail-server.nix
index b482176..82f4f6a 100644
--- a/nix-system-configs/modules/system/mail-server.nix
+++ b/nix-system-configs/modules/system/mail-server.nix
@@ -88,7 +88,9 @@ in {
           listener = {
             smtp = {
               protocol = "smtp";
-              bind = "[::]:25";
+              # Use port 587 for SMTP submission with STARTTLS, as port 25 is often blocked by ISPs for outgoing mail to prevent spam.
+              # This way, you can still receive mail on port 25 but require authenticated submission on port 587.
+              bind = "[::]:587"; # I am so fucking fed up this shit, this fucking ISP is sending me to early grave.
             };
             submissions = {
               bind = "[::]:465";