How to configure smtp.sendgrid.net smart host IIS equivalent with KumoMTA?

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1

Is it possible to replace a Windows IIS Virtual SMTP Server with KumoMTA (on Linux), so that we can use it as a simple MTA that receives emails from multiple internal servers on the same domain (each server separated by their own unique port number) and then have that traffic forwarded to the SendGrid smart host smtp.sendgrid.net so we can take advantage of their advanced analytics.

This would be outbound emails only and SendGrid would handle Sender Authentication, so this wouldn’t need to be setup by KumoMTA and we would use SendGrid’s DNS settings.

Screenshot attached of the current IIS port setup. Client specific info blurred out.

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2

Hey there @passionate-grasshopp, thanks for posting. Please read the “Troubleshooting” and “How to Ask for Help” buttons below. If you would like a 1:1 support session from the KumoMTA team, details are at the “Book a Support Session” button below.

3

Yes, that is possible, see Custom Destination Routing - KumoMTA Docs

tom (Tom Mairs) 4

:index_pointing_up:

5

If I understand it correctly, then this is a very straight forward use case. Set up KumoMTA to accept all mail from your internal hosts just as you have IIS setup now, then in the smtp_server_message_received function set the routing meta to smtp.sendgrid.net:

msg:set_meta(‘routing_domain’,‘smtp.sendgrid.net’)

Now in the shaping file, add the credentials for your sendgrid account:

smtp_auth_plain_username = "APIKey"
smtp_auth_plain_password = "ffe0REDACTEDREDACTED87a"
smtp_port = 587
enable_tls = "Required"
6

Since Sendgrid manages all teh oputbound delivery and negotiation, you dont even need to set up TSA, shaping, DKIM, etc…

7

That is assuming all your mail routes through Sendgrid.

8

Thank you :star_struck:

9

Thank you :star_struck: