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SMTP connection timeout on port 465 when resetting password via Amazon SESOct 2025
Casdoor

Hello,

We are encountering an issue when sending emails through Amazon SES on port 465 from Casdoor.
The error returned is:

dial tcp 15.236.68.209:565 i/o timeout

After investigation, we confirmed that Amazon SES is fully operational, and port 465 is open and reachable from external networks:

nc -vz email-smtp.eu-west-3.amazonaws.com 465 → succeeded

This suggests that while SMTP connectivity to Amazon SES works correctly, Casdoor’s SaaS servers may be unable to establish outbound TCP connections to Amazon SES, possibly due to egress network restrictions or firewall rules.

Could you please check whether outbound traffic on port 465 is allowed from your servers?

Thank you in advance for your assistance.

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SMTP connection timeout on port 465 when resetting password via Amazon SESOct 2025
Casdoor

We use Amazon SES as our SMTP service.

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