503 Valid RCPT command must precede DATA

Hello,

If you are facing an error "503 valid RCPT commands must precede DATA" when you try to send an email. Some common solutions that might be helpful to resolve this error:

1) Apostrophes - Remove any apostrophes (single quotes) or other non-alphabetic characters from your email account name(s).

2) SMTP Port - Use Port 26 (Instead of the default 25) for outgoing mail OR (TLS-587 OR SSL-465)

3) Server Authentication - Set up your outgoing mail to use outgoing server authentication (sends mail by logging in with your email address and password).

In Outlook, Follow these steps below:
1) Open Outlook
2) Go to Tools/Email Accounts
3) Select the Account and click Change
4) Click on More Settings
5) Click on Outgoing Server Tab
6) Click "Outgoing Mail Server (SMTP) requires authentication" and make sure "Use same settings as incoming mail server" is selected.

Now, try sending an email in Outlook using the domain account.

4) Outlook PST files - Sometimes the 503 error will occur if your Outlook PST file is corrupted. Try repairing the file. (Before repairing PST file, take a backup at safe side)

For more information, refer this source URL: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other/503-valid-rcpt-command-must-precede-data/c9f20070-7021-460b-adda-b1cfe81b8162

  • 503 Valid RCPT, Outlook Error, Unable to send email, Outlook Port blocked, precede DATA
  • 3 Users Found This Useful
Was this answer helpful?

Related Articles

Outlook Error - 100502

Hello Everyone, Sometime, it happens that you are getting error - 100502 in outlook for...

0x8004210B - The operation timed out waiting for a response from the sending

Hello Folks, If you have received an error "The operation timed out waiting for a response from...

Outlook Error – 0x80042108

Dear Everyone, Whenever your outlook returns with an error “0x80042108” that means that there is...

451 Greylisted, please try again in 60 seconds

If you receive the error 451 Greylisted, please try again in 60 seconds when sending an e-mail....

550 This message was classified as SPAM and may not be delivered

It seems SMTP Authentication is not enabled in your Email client and throwing an error “550 This...