SMTP connect() failed

[linmuqin]

2021/05/31 09:28:35 [error] 1928#1928: *1 FastCGI sent in stderr: "PHP message: Send reset URL https://ssp:8089/index.php?action=resetbytoken&token=3vUCAG8MEQmsO5ExZQaXvCLZA1ccdar4h8bZvPIoI%2Fsggg7Z%2BgQfEi1drcAuBlGEn8D0VfLqWJj%2BMjbwynades5yG2hObRpHVcErjkM7bSFZi3sQ3rE5Y9yiKTpofMOjvV0UWbIrLCO4e8mwSOGC%2B%2Fo%3DPHP message: send_mail: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/TroubleshootingPHP message: Error while sending token to [email protected] (user linmuqin)" while reading response header from upstream, client: 119.139.198.161, server: , request: "POST /?action=sendtoken HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "ssp:8089", referrer: "http://ssp:8089/?action=sendtoken"

[linmuqin]

I can access the mail server, but the mailbox has not been able to receive emails. I turned on debug=4, but I didn’t see any logs. Please help. The compose configuration is as follows
version: '3'

services:
self-service-password:
image: 'tiredofit/self-service-password:latest'
container_name: 'self-service-password'
ports:
- '8089:80'
environment:
- LDAP_SERVER=ldap://ldap-server:389
- LDAP_BINDDN=cn=admin,dc=xxx,dc=com
- LDAP_BINDPASS=xxxxxx
- LDAP_BASE_SEARCH=ou=xxxx,dc=xxx,dc=com
- MAIL_FROM=[email protected]
- SMTP_DEBUG=4
- SMTP_HOST=smtp.qq.com
- SMTP_USER=[email protected]
- SMTP_PASS=xxxxxxxx
- SMTP_PORT=465
- SMTP_SECURE_TYPE=ssl
- SMTP_AUTH_ON=true
- IS_BEHIND_PROXY=true
volumes:
- ./srv/self-service-password/data:/www/ssp
- ./srv/self-service-password/logs:/www/logs

[linmuqin]

I can't open the resetURL in the nginx log,But I think this shouldn’t affect receiving mail