Actually to be fair, mine works fine and always has. The final boss is making Hotmail/live/Microsoft actually accept your email despite you jumping through all the hoops to have perfect spam score.

Would never want to do it. I don’t wanna be responsible for the outage and them needing an important email.

I had read his post. There were plenty of other comments asking how/where and this makes it an easy option.

Well I didn’t want google to read my mails

Sadly, it only works if no one in the recipients of the mail is on gmail (or if everyone use pgp, which I would tend to think is even more rare).

I host my own mailserver as well, and I would add as benefits:

• creating as many email address as you want easily, possibly regexp based address (awesome to give every site a different address and know where the spam comes from, without using the well known schema username+something@host). That also makes routing/filtering mails way more easy, you just have to match the recipient address.
• delivering mails to software, to put email at the center of interapps messaging (basically, that means that postfix pass a matching email to the executable of your choice on your system instead of storing it in your mailbox)
• advanced rules for handling emails. When I want to block a spammer that managed to get my real email, I use regexps to match their mails and reject it with a “REJECT 5.1.1 Recipient address rejected: User unknown in local recipient table” error, imitating the error for unknown users, which often triggers a mail system to remove your address from their database
• easily configure apps to send me email. When I write an application that will send emails to me and only me, I configure it to use my smtp on port 25 without authentication instead of the usual smtps configuration they expect. It connects to it and asks to send a mail to me, which is accepted since I’m a local user. It makes everything way easier (try to do that with gmail and get your IP banned)
• easy backups. Both of the mail system (I backup the whole sdcard of the pi) and of the emails. Never lose an email again.

Thank you!

Yeah, I’d recommend using rspamd for lower-end hardware over spamassassin. Might be a bit more work to set up, mostly because it’s not as popular, and there are fewer tutorials, but it doesn’t have the overhead from running on perl like spamassassin. That said, while there are people using rspamd on systems with 512MB of ram, they are usually smaller, personal setups that aren’t dealing with hundreds of emails a day.