I installed postfix to send notifications with system information. And i get error in my logs:

 postfix/smtp[3687]: connect to gmail-smtp-in.l.google.com[]:25: Connection timed out

Uptime of my system about 8month

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I was and have asked the staff. Not yet received an answer (gmail / hotmail)

  • message from hotmail: centos-s-12vcpu-48gb-sgp1-01 rejected your message to the following email addresses:

    message from gmail: The response from the remote server was:
    550 authentication required

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