[toun]

The topic often comes up. Can't say I share the experience. My servers have never been put on a blacklist in the 7 years they've been running, and one of them operates from my residential DSL connection. Standard postfix+dovecot stack on an Archlinux VPS, I log in once a year to update the packages and make sure there is enough disk space left.

[tacon]

Essentially all residential IPs are blacklisted for email servers, at least on port 25. Many ISPs blackhole any traffic on port 25 to residential IPs. Do you have port 25 working on your residential connection?

[NavinF]

Isn’t port 25 used for unencrypted traffic as opposed to port 465? I’m pretty sure I had a working mail server back in 2012 behind an ISP that blocked port 25.

[toun]

It's blocked by default but my ISP lets me open it. But as noted by NavinF I'm not using it anyway.