我正在服务器 ubuntu 18.04 上的 amazon aws ec2 上工作...我正在尝试使用 phpmailer 发送邮件..当我单击发送邮件时，它会显示邮件已发送消息...但我没有收到任何邮件。当我转到 mail.log 文件检查它显示的错误时..它显示以下错误
postfix/smtp[32208]: warning: database /etc/postfix/sasl_passwd.db is older than source file /etc/postfix/sasl_passwd
Nov 6 05:33:52 ip-172-31-16-223 postfix/smtp[32208]: ECD64BE5CC: to=<archipatel20@gmail.com>, relay=mail.uway.in[166.62.28.116]:587, delay=1.9, delays=0.01/0.02/1.6/0.23, dsn=5.0.0, status=bounced (host mail.uway.in[166.62.28.116] said: 550 SMTP AUTH is required for message submission on port 587 (in reply to RCPT TO command))
Nov 6 05:33:52 ip-172-31-16-223 postfix/cleanup[32206]: C81D4BE60F: message-id=<20201106053352.C81D4BE60F@ip-172-31-16-223.us-east-2.compute.internal>
Nov 6 05:33:52 ip-172-31-16-223 postfix/qmgr[32200]: C81D4BE60F: from=<>, size=2669, nrcpt=1 (queue active)
Nov 6 05:33:52 ip-172-31-16-223 postfix/bounce[32210]: ECD64BE5CC: sender non-delivery …