- 确认smtp_psa中包含有:env = SMTPAUTH=1 SHORTNAMES=1
- 生成无效的用户名并base64编码:printf '<validalias><bogustext>' | base64
- 将邮件用户的有效口令编码为base64:printf '<validpass>' | base64
- telnet到邮件服务器的smtp端口:
< 220 HELO mailserver ESMTP
> >
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