I use O365 Business (Or whatever the heck they call it now) for my email, so for SMTP on all my devices at home, I use an O365 account with an app password, sending as a distro-group so it can have a custom name
This works, but I don’t like how every device/server has O365 creds in it. I am thinking I should setup an SMTP Relay at home locally, which sends to O365 (Or Sendgrid, etc etc) and then SMTP on local services can just point to that local address
Is this the right way to go about it? What is the current best software do it? I’ve only ever had experience using IIS to do this, and of course I don’t want to be running windows!
I’ve started using SMTP2GO for all my notification. Up to 1000 email/month it’s free. So I don’t have to rely on Google/Microsoft account/changes that they do every once in a while.
I’ve been thinking about using that as an SMTP relay as well (Because my email server doesn’t have reverse DNS). Would you recommend it?
Definitely! I’ve been using without any problem the free version.
I haven’t found any reason online for not using it either, so I guess I’ll just use that. Free account should be more than enough for me too, no way am I going to send more than 1000 emails a month.
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
Fewer Letters More Letters DNS Domain Name Service/System IP Internet Protocol SMTP Simple Mail Transfer Protocol
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Interactive (i.e. end-users) Clients should be using OAuth instead of app passwords. This will allow your users to use their own Office365 credentials for SMTP.
For servers and non-interactive clients (e.g. copiers/printers/toasters/coffee makers) I would suggest something along the lines here: https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365#compare-the-options
Best bet would be to setup postfix or opensmtpd as an open relay. Just make sure it is only accessible in trusted networks though!!
https://docbot.onetwoseven.one/services/postfix/
You’d want to set the listen address to 0.0.0.0 and use a non-loop back interface.