> The only caveat is time - time for SMTP servers around the world to know that your mail server's IP is not sending spam - and filling out some forms to unbloc

> The only caveat is time - time for SMTP servers around the world to know that your mail server's IP is not sending spam - and filling out some forms to unblock the server's IP address. You can save yourself a lot of hassle by using a mail relay with a good reputation for all outgoing mail. That's what I do: I run my own mail server so I have full control about spam filtering etc, all incoming mail goes directly to my server. When I send an email my server does the DKIM signing itself and then forwards the message to an external realy (with SMTP Auth). I use https://posteo.de/en https://posteo.de/en for that because it only costs 1 € per month, doesn't require any personal data to create an account and it lets you send emails with any from address (not having from address filtering is important here). Their servers have a good reputation so I have no problems having my mail delivered.