@dashrender said in Local SMTP relay?:

@pete-s said in Local SMTP relay?:

@voip_n00b said in Local SMTP relay?:

@pete-s said in Local SMTP relay?:

Do you have any pointers on how to configure postfix for this?

Lots of guides when googling "postfix smtp relay"

Here is one:
https://www.lisenet.com/2018/configure-postfix-to-relay-mail-to-an-external-smtp-server-on-centos-7/

Thanks! It looks simple enough and I hope it is.

When I looked at the postfix documention it seems like it's a lot more complicated than that.

is CentOS still where people want to be for things like this?

Not generally and never CentOS 7.

Currently driving, but should be able to look at update relatively soon.

Yup, basically just automating Postfix configs.

@zachary715 said in How to receive e-mail alerts from internal devices:

Do you guys go beyond the SPF records and also implement DKIM or DMARC? I've looked into these briefly but not much. DKIM looks fairly straightforward with Office 365.

I've checked them both. I will not implement DKIM anytime soon. It adds little on top of SPF.

DMARC is a layer on top of SPF and/or DKIM you cannot use DMARC without one of the other in place.

All DMARC does is tell the recipient system what to do with a message that fails the SPF/DKIM check. Instead of letting the recipient system decide what to do about it.

Setting Postfix up as a smarthost's pretty straightforward. I've done it in reverse as an inbound mail gateway instead of using an MS Exchange Edge Transport role. I'm guessing you'd be allowing access based on IP?

While you want to keep it simple, I can't stress strongly enough to use at least outbound spam filtering. That way, in case you do somehow start churning out spam, it'll get caught before your IP gets blacklisted.