Temporarily turn off the Windows Defender firewall. To fix the 503 Valid RCPT command must precede DATA error in Outlook, follow these steps: Fix 503 Valid RCPT command must precede DATA error in Outlook Delete old mail to free space in the mailbox. If you need help with your HostPapa account, please open a support ticket from your dashboard.3. Enter your password and click the Save Password box to save your password and avoid re-entering it in the future. 
The first time you check your email, you’ll be asked for your account password.
In the SMTP window, set Connection security to SSL/TLS, Authentication method to Normal password, and enter your email address in the User Name field. Select the SMTP server you wish to change and click the Edit button. The Outgoing Server (SMTP) Settings display in the right panel. Scroll to the bottom of the Accounts panel and click Outgoing Server. Open the Tools menu and select Account Options. Here’s how to set it up in Thunderbird (V52): How you set up SMTP Authentication depends on the email client you use. Add your email address and password to the SMTP settings, and you won’t receive any more Outlook Error 503 Valid RCPT command must precede DATA messages. Setting up SMTP AuthenticationĬonfiguring SMTP Authentication in your email client requires you to edit your email account SMTP (outgoing mail) settings. More often, Outlook Error 503 tells you that you need to set up SMTP Authentication in your email client. You’ll then be able to send an email if this is the problem (most common with Outlook). However, if you attempt to send an email after about 30 minutes and see this message, simply check your email for new messages. When you first open your email client, it automatically checks your email first. Your email client isn’t set up for SMTP Authentication. Your email server requires you to check email first before sending an email (checking email first is one way your email provider manages the security of your email account). The two most common causes for this error are: It’s telling you that your email server did not properly authenticate your SMTP (outgoing mail) connection. Error 503 Valid RCPT command must precede DATA can occur when sending an email.
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