503 valid rcpt command must precede data outlook 2013

Considering we have changed nothing with our account settings, I can’t see why this problem would turn up. While it does work in Thunderbird, that is not an acceptable solution. I finally tested settings in Thunderbird and we are able to send externally through all accounts on all machines. They tested sending from our accounts in their building and it works fine. I have called our service provider and they insist that the issue is on our end. Verifying our domain was not SPAM blacklisted.Settings for POP3, POP3S (SSL), IMAP, IMAPS (SSL), SMTP, and SMTPS (SSL).Verifying ‘My outgoing server requires authentication’ and ‘Use same settings as my incoming mail server’ are enabled.Verifying SMTP port 26 is selected instead of the default of 25.

‘ 503 Valid RCPT command must precede DATA ‘ If it fails on send then repeat starting from 7.ĩ) Check the box Beside 'The server requires an encrypted connection (SSL)'.We are having intermittent sending issues with all accounts on our domain, and constant issues on one account all using Outlook.Įvery message sent to an external domain returns undeliverable with the following message. If using MS Outlook, please try the following:ģ) Select the Account with the trouble and click ChangeĦ) Click 'Outgoing Mail Server (SMTP) requires authentication' and make sure 'Use same settings as incoming mail server' is selected (see attached image)ĩ) Click Ok and then Test Account Settings You will be able to send mail without having to 'pop' your mail box first. After 30 minutes you have to authenticate again.ī) Configure your email client to authenticate automatically by checking the 'my server requires authentication' box in your email configuration. This adds your IP address to a relayhosts file and allows any email to be sent from that IP address for up to 30 minutes.

This means you must check your email before trying to send mail meaning that our mail server requires authentication, which can be achieved using one of these methods:Ī) Pop before smtp - check your email for new mail before trying to send email. The following recipient(s) could not be reached: When sending email, you receive an immediate bounce such as the following:

503 valid rcpt command must precede data outlook 2013