Can anyone help with my Microsoft Outlook Express. Every time I try to send an email I get the following message:
An unknown error has occurred. Subject :.................. Account: 'mail.btinternet.com', Server: 'mail.btinternet.com', Protocol: SMTP, Server Response: '451 Invalid Smtp line - Should end with CRLF', Port: 25, Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC6A
I have changed the subject to a row of dots for the sake of privacy but the rest of the message remains unchanged. This has started to happen within the last few weeks. At first it was occasional but now it seems to be with every email I try to send. I can receive email with no problems.
To shed more light on the problem, apparently "It means that the email has not been correctly composed to SMTP (Simple Mail Transfer Protocol) standards. CRLF means carriage-return-line-feed which is the so called "normal" text file line terminator in Microsoft Operating systems (only)" ClickHere and AlsoHere