SMTP 553 ErrorI recently started getting 553 errors on my BT email account and thought it was time to explain what they are: When you send email you use a protocol called SMTP (simple Mail transfer protocol). In the early days of the internet you could connect you email client to any SMTP server on the internet and send the email. That soon stopped with the rise in spam messages and mail providers started requiring SMTP authentication before you could use their SMTP servers to send email. This effectively meant that you needed an email account with that provider. Although that move is effective against spam it doesn't protect against Phishing so now email providers are now examining the sender email address and checking that it is the same as the receiving email address. This is ok if you have only 1 email account configured but if you are using multiple email accounts then you will have multiple receive addresses. To prevent errors you will need to be able to associate the alternate email addresses to the main email address. If it isn't possible to do this then you will need to use either multiple identities -one for each email account or multiple windows logon accounts or multiple email clients. Resources and References: |