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www.emailquestions.com/threads/530-5-5-1-authentication-required-on-port-25-secure-ssl-yes-server-error.334

Hello, Do you get an error like the following when trying to send an e-mail with Gmail? 530 5.5.1 Authentication Required on Port: 25, ...

stackoverflow.com/questions/17227532/gmail-530-5-5-1-authentication-required-learn-more-at

Jun 21, 2013 ... Get to your Gmail account's security settings and set permissions for "Less secure apps" to Enabled. Worked for me.

deaimobi.com/mbnk-271

2015年9月9日 ... Gmailをメールソフトで送信しようとしたら出たエラーへの対処方法メモです。530 5.5.1 「530 5.5.1 answer=14257」というAuthentication Required ...