On 3/17/24 04:52, Michael Voorhis via WLUG wrote:
Outgoing SMTP is not blocked and will function, but is frequently blacklisted by recipients who refuse to accept email originating from a residential IP block. I have a relay in Amazon-EC2 that sends the email. Some recipients continue to not like that, but doing SPF/DKIM/DMARC goes a long way, and I've had no trouble sending to recipients at gmail and at various MS outlook/o365ish recipients.
+1 to SPF/DKIM/DMARC dealing with a lot of challenges related to selfhosting email. I'm not using my residential IP, but they're still really easy to set up for a large payoff.
The biggest issue I have is that if the cablemodem goes offline for a long enough time, my IP address changes. But I've got by now a well-established checklist of stuff that I need to do when the house IP changes, so I just walk through the list and all is well in a few minutes. Decent email senders will queue the bounced email for a few days before bouncing back to sender and I'm not aware of having lost anything.
I've found that OctoDNS + iCinga pair well for both detecting when my external IP changes, and getting fresh DNS records out quickly. I wonder how difficult it'd be to figure out some automation to do it all for me... --cs