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FIX ERROR " 551 Sender address is not valid for your login"

If you are getting the error (also in screenshot) "551 Sender address is not valid for your...
FIX Email Error "Login failed" outgoing and incoming mails, qmail plesk

The issue you are facing is due to the password inserted for the email address in the email...
FIX Error "550 sorry, no mailbox here by that name", Permanent Error, Qmail Plesk

If the client is getting the below error when he/she is sending email to mail account in your...
FIX Error "Mail quota exceeded", Permanent Failure, Qmail Plesk

If the sender is getting the below error when he is sending you the email then you need to...
FIX Error: rblsmtpd, unable to send emails out

When sending an email out if you get an error like An error occured sending mail: The mail...
FIX: Error "Protocol: SMTP, Server Response: '551 This mail server requires authentication before sending mail from a locally hosted domain"

Please follow the following steps if you are getting the following error while sending out emails...
Getting Error "Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'"

The above error you are getting while recieving emails in outlook express is due to header of...
Getting error "Error Number: 0x800CCC0F" in Outlook Express.

Please check the following if your are getting the below error when sending email from Outlook...