"503 valid rcpt command must precede data" 错误表明在尝试发送邮件数据(即邮件正文)之前,SMTP服务器未收到有效的RCPT TO命令。在SMTP协议中,RCPT TO命令用于指定邮件的接收者。这个错误通常意味着SMTP客户端没有正确地按照协议顺序发送命令。 2. 可能导致该错误的原因 命令顺序错误:SMTP客户端可能在
503 Valid RCPT command must precede DATA 503 Valid RCPT command must precede DATA“Sending’ reported error (0x800CCC65) : ‘Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider...
Check the box "My Server Requires authentication" Click OK. For Thunderbird: Tools > account Settings At the bottom of the list of options on the left is "Outgoing Server (SMTP)" Select this option and then "Edit" the problematic account. Check the box under "Security and Authentica...
Pop before SMTP -- Run a check for new messages (F9 key in Outlook) before sending your message and restart and rerun your spam filter application. Your IP address is entered in a relayhosts file, allowing email to be sent from your address for up to half an hour.If the p...
Hi Guys, I’ve been getting an issue with a particular email account which goes through our domain registrar names.co.uk. When an email is sent to two particular email addresses, both of which belong to the same domain,…