Maddy comes with a lot of the 'good stuff' like DKIM and DMARC ready to be used, whereas setting that up yourself with Postfix was a pain (from my experience a few years ago) and probably meant you didn't bother.
I've had better deliverability, especially to Gmail and Microsoft, since using Maddy, probably for this reason.
Now, of course, I must admit that self-hosted e-mail seems like it will always inevitably run into a blocklist problem, usually because of IP neighbours. But personally, I've managed to avoid that in the last year that I've been running Maddy -- main exception is I had to fill in Microsoft's silly form to get unblocked at the start (but I've had to do this for every deployment I've ever done).
I dunno, I'm pretty shit when it comes to Unix systems and programming in general (spent 6 hours fighting a postcss and tailwind config file and lost) but I got dkim and dmarc set up on my own server for my own mail in maybe 30 minutes?
So you agree is not about the software but you did not implement best practices with Postfix.
Also, whenever you give an address to someone else, family or friend, risk of going to spam increases.
Links or src in emails without https, higher risk,
Does Maudy prevent you from doing that?
And your sales people will call this a misconfiguration serious enough to fire the sysadmin who did this. The problem is that, typically, nobody trains or supervises the filter applied to the outgoing mail, and nobody is warned that it did, in fact, reject an email, and there is no manual override if the filter is, in fact, wrong. And spammers (from the viewpoint of a particular organization) don't exist and can't exist inside the organization, so any rejected outgoing email is, by definition, a false positive.
Maddy comes with a lot of the 'good stuff' like DKIM and DMARC ready to be used, whereas setting that up yourself with Postfix was a pain (from my experience a few years ago) and probably meant you didn't bother.
I've had better deliverability, especially to Gmail and Microsoft, since using Maddy, probably for this reason.
Now, of course, I must admit that self-hosted e-mail seems like it will always inevitably run into a blocklist problem, usually because of IP neighbours. But personally, I've managed to avoid that in the last year that I've been running Maddy -- main exception is I had to fill in Microsoft's silly form to get unblocked at the start (but I've had to do this for every deployment I've ever done).