Using Traefik outside of k8s is for masochists. Especially after configv2. Caddy is by far the easiest reverse proxy to configure and has the sanest defaults.

I wasn’t looking for technical support. You can do everything correctly and still get your mails randomly marked as spam or not delivered at all. This has happened to us, some of our customers, multiple smaller email providers as well as several municipalities (imagine blackholing government emails, what a grand idea). They don’t send sensible return headers, they might not even return your undelivered mail at all, they won’t react to any inquiries to their postmaster contact (or anywhere else really), they will blacklist entire IP blocks sometimes. The only way to sidestep any issues with them is to pay a few thousand bucks to enter their cool kids club certified sender alliance, which is what the big marketing firms use to deliver mass amounts of unwanted ads unhindered through their networks.

It is cheap, but the performance leaves much to be desired and their technical support is piss poor.

I’ve had the opposite experience with their cloud services in a professional context. My biggest gripe is with United Internet, the monopolistic company that owns IONOS, 1&1 (an ISP) as well as the ad-ridden, flaming pile of garbage that are GMX and WEB.DE, two of the most popular email service providers in Germany as well as a constant source of pain for anyone operating an Email server. They will ignore common industry standards and best-practices, silently block your mailserver for absolutely no reason, not respond to inquiries and just generally make the internet a slightly worse place for small to medium sized businesses and selfhosters.

It’s an alternative, but IONOS honestly fucking sucks as well, so I’m feeling pretty ambivalent about this.