Exchange 2016 - smart host

Exchange 2016 on prem - Smart host.... Currently using our ISP as smart host, it works ok however some emails are being rejected. are there any other free ones we can use? I heard somewhere google had one? does it still exist? if so, is it any good?
Jack 50Asked:
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Saif ShaikhServer engineer Commented:
You can add 8.8.8.8 as alternate dns which is free. However if some emais are rejected then is there any NDR. please provide complete header of rejected email so that I can provide you solution. Also if they are rejected from remote domains then you need to inform the remove domain administrator to whitelist your domain.
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Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
@Saif Shaikh Nono, he's not asking about DNS, you are inside an exchange server DO NOT PUT A PUBLIC DNS ON THE EXCHANGE OR AD SERVERS that's the worse practice a new tech can do. Please stop this bad practice.

To configure correctly your DNS use the Forwarders tab in your DNS to properly forward the queries that are not internal to the Internet in that tab you can add google 8.8.8.8 and 8.8.4.4 that's good but not directly on the cards of your servers because google does NOT know a thing about your internal infrastructure.

Now... Smart hosts are Antispam, you can't use any for free. The only option is to have an account paid of O365 and use the MX of O365 or hybrid environments.

What you can do to strengths the security is to configure SPF, DKIM, and DMARC on your mail server.
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Jack 50Author Commented:
Jose, not entirely correct...smart hosts can be ISP, in which case are free.... i think i used send grid... now looking at socket labs.... thought google might have had one or something.
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timgreen7077Exchange EngineerCommented:
If you don't have a smart host then don't use one. There is no need to use a smarthost on the send connector if you don't have one, instead of smarthost just select "MX Record associated with recipient domain" instead of smart host. That will use DNS to get the MX record for the recipient domain and send the mail. Smarthost is not a requirement, and if you don't have one, just don't use that option. I don't use a smarthost either on my exchange 2016 server here at home.
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Jack 50Author Commented:
NO real help. found socketlabs.. they provide what i want for only $10 per month...
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