KumoMTA Email Sending Issue - Connection Timeout, Need Help!

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1

Hello everyone,
I am facing an issue with KumoMTA while sending emails, and I’m hoping to get some advice or suggestions from the community.

Issue Description
When attempting to connect to the target SMTP server mail.mr-pig.com on port 25, the connection times out, and the initial SMTP banner is not received. The timeout is set to 60 seconds.

Here’s an excerpt from the debug log:[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === BeginSession 2024-11-17 10:00:31.581866032 UTC
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === conn_meta egress_pool=“unspecified”
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === conn_meta egress_source=“unspecified”
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === conn_meta id=“d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca”
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === conn_meta mx_plan={“Addresses”:[{“addr”:“43.242.203.13”,“name”:“mail.mr-pig.com.”}]}
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 0ns === conn_meta ready_queue_name=“unspecified->mail.mr-pig.com@smtp_client”
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 822µs === INFO: Attempting connection to ResolvedAddress { name: “mail.mr-pig.com.”, addr: 43.242.203.13 } port 25
[d1dbcb03-99ef-4d4e-b0f0-eb17e68b41ca] 60s === ERROR: connect to ResolvedAddress { name: “mail.mr-pig.com.”, addr: 43.242.203.13 } port 25 and read initial banner: deadline has elapsed

3

Have you tried to telnet to that host on port 25 from the KumoMTA box to see if it shows a banner?

4

If that’s only happening with the one destination I’d be inclined to blame the destination domain.

5

thanks