Office365 Direct Send without Relay
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@NerdyDad I'll give it a try.
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Doesn't seem to work, what else should I look at?
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That is typically all that I need to do. I'm sure you already have the right port open on your firewall pointing to O365.
My environment doesn't require authentication. Does yours?
Also, make sure that you check O365 ports for protocol traffic on the devices that you are trying to connect.
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What I've done in the past is setup a local relay. Something that only accepts traffic from the various devices and relays it out to O365. You can use Postfix and Microsoft's SMTP server to do this.
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@coliver said in Office365 Direct Send without Relay:
What I've done in the past is setup a local relay. Something that only accepts traffic from the various devices and relays it out to O365. You can use Postfix and Microsoft's SMTP server to do this.
I've heard of this being done. Either with the old on-prem exchange server being turned into a relay or building out a new relay entirely. I'm not an Exchange expert by any means so I cannot speak as to how to do it. I just know that it can be done.
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@NerdyDad said in Office365 Direct Send without Relay:
@coliver said in Office365 Direct Send without Relay:
What I've done in the past is setup a local relay. Something that only accepts traffic from the various devices and relays it out to O365. You can use Postfix and Microsoft's SMTP server to do this.
I've heard of this being done. Either with the old on-prem exchange server being turned into a relay or building out a new relay entirely. I'm not an Exchange expert by any means so I cannot speak as to how to do it. I just know that it can be done.
Here are the different options you can use. Some of them are limited to only send to users on your domain.
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For only basic email traffic needs like scan to email, just setup a connector in Office 365.
Exchange Online has various rate limits though. So if you think you will be even close to them, use postfix locally to send out and just add your local WAN IP to your SPF record.
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I got it sorted, separate spam filter relay is what was needed.
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@JaredBusch said in Office365 Direct Send without Relay:
For only basic email traffic needs like scan to email, just setup a connector in Office 365.
Exchange Online has various rate limits though. So if you think you will be even close to them, use postfix locally to send out and just add your local WAN IP to your SPF record.
Why wouldn't your local relay still relay everything through Hosted Exchange in O365? or would that be rate limited as well?
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@Dashrender said in Office365 Direct Send without Relay:
@JaredBusch said in Office365 Direct Send without Relay:
For only basic email traffic needs like scan to email, just setup a connector in Office 365.
Exchange Online has various rate limits though. So if you think you will be even close to them, use postfix locally to send out and just add your local WAN IP to your SPF record.
Why wouldn't your local relay still relay everything through Hosted Exchange in O365? or would that be rate limited as well?
Exchange Online has limits. it does not matter from where the email originate. The software was actually setup to authenticate and send email directly with and Exchange Online account during testing.
This quickly hit the rate limits as the client was sending out large amounts of price notifications to users that has signed up for such.
So this site had a local CentOS 7 box setup and Postfix was configured to send mail out. The SPF record was updated and then a connector was also setup to make sure nothing was blocked for no reason.
