Tuesday, November 24, 2009

Outlook: 503 Valid RCPT command must precede DATA

SkyHi @ Tuesday, November 24, 2009
The original message was received at Mon, 19 Oct 2009 17:54:42 -0700 from webmail.pro.net []

----- The following addresses had permanent fatal errors -----
(reason: 550 No Such User Here)

----- Transcript of session follows ----- ... while talking to jaguarrichmond.com.:
>>> DATA
<<< 550 No Such User Here
550 5.1.1 ... User unknown <<< 503-All RCPT commands were rejected with this error:
<<< 503-No Such User Here
<<< 503 Valid RCPT command must precede DATA

Use Spam Bully for Outlook and Outlook Express

The 503 valid RCPT command must precede DATA error is a common one that often occurs as a result of the spam software you're using, or as a result of Outlook's default spam utility. We recommend giving Spam Bully a try. You can try it for free, and it's one of the better known and more powerful spam filters. You can nail two birds with one stone - get rid of this annoying error and get rid of your annoying spam messages at the same time. Look at the error as a blessing - it helped you find Spam Bully Smiling. Click here for details and to download a free trial.
503 valid RCPT command must precede DATA

We recently got this error when trying to send an email in Outlook. The culprit? Apparently this occurs when a server is expecting to receive mail before sending. This is usually results from server authentication priorities (for example, you attempt to send mail before your "spam filter" has finished its receiving process.)
Solutions to resolve the 503 RCPT error

* 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 problem still persists check "my server requires authentication" to authenticate automatically. With this setting you can bypass the check above and send mail without having to "pop" your mail box first. You can also try changing the outgoing port from 25 to 26, since some ISP's block this port.
* One of our readers pointed out that it may help to remove apostrophes from your email account names.
* Finally, if using a mail screening utility such as Mail Washer, you may want to disable the "automatically check at intervals" setting and check mail manually. If the system checks mail while you are sending you may get this error.

If these don't work, check your mail server

If none of the above work we recommend contacting your hosting provider. Your mail services account needs to be set up properly (associated with the right user name, etc.). We encountered this exact problem when switching hosts once - the mail server configuration got goofed up, and none of the above solutions worked. In the interim (until settings are fixed by your hosting provider) you can adjust your outgoing mail server to reflect that which your ISP uses, which should let you send mail again through your local client (Outlook, but not from the server (Webmail)), until the problem is fixed.