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in my previous sasl_passwd file, the password is my REAL password for gmail account. that should be okay right? or should i just put 'password' instead?
You can stop postfix service and then delete the file. And then create file using echo command and you will need your real gmail account password to authenticate.
You can change back. But it would not matter. Port number is at their end and not yours. And I can telnet from my end. Google has policy where in they treat some number of requests in a particular amount of time to be spam. So you have to limit that. Not just google but most of the SMTP relays have relay limits per user or per IP. After that the requests are either banned or termed spam. This is done to prevent spams and bulk mails.
You do not limit that. Its them who limit the requests for spam and bulk mailing. You can not control the server at their end and neither can you do anything about the policies. Those policies are there to prevent their servers from being misused for spamming.
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