Port 587 (SMTP)

HoneyLabs honeypots recorded 387 probes against destination port 587 (SMTP) from 139 distinct source IP addresses in the last 7 days.

First observed 2026-08-08 22:37:42, most recently 2026-08-15 17:16:34 (UTC).

Most active source addresses

Source IPProbesNetworkCountry
3.129.187.3828Amazon.com, Inc.US
18.116.101.22027Amazon.com, Inc.US
18.218.118.20320Amazon.com, Inc.US
156.225.1.399AGOTOZ PTE. LTD.HK
156.225.1.1159AGOTOZ PTE. LTD.HK
156.225.1.339AGOTOZ PTE. LTD.HK
156.225.1.319AGOTOZ PTE. LTD.HK
123.58.219.269UCLOUD INFORMATION TECHNOLOGY (HK) LIMITEDHK

Networks it comes from

ASNOrganisationProbesSource IPs
AS16509Amazon.com, Inc.997
AS135377UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED9011
AS9465AGOTOZ PTE. LTD.364
AS396982Google LLC3126
AS14061DigitalOcean, LLC2917
AS8075Microsoft Corporation2323

Where it comes from

CountryProbes
United States246
Hong Kong63
Germany14
Singapore10
United Kingdom10
Thailand8

Client strings seen on this port

User agentProbes
visionheight.com/scan Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) Chrome/126.0.0.0 Safari/537.3670
Hello from Palo Alto Networks, find out more about our scans in https://docs-cortex.paloaltonetworks.com/r/1/Cortex-Xpanse/Scanning-activity27
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.016
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.3616
Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.08

Port report

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