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553: Sorry, that domain isn't in my list of allowed rcpthosts
This error occurs when a user tries to send mail and the server blocks the mail from being sent. There a number of reasons as to why this occurs and we will discuss a few of them below.
1) TWD Hosting email is configured to authenticate using POP rather than SMTP. This means that our server verifies who you are based on the incoming mail server, your username, and password. When you check incoming mail, the server opens a gateway of 20 mins where it will allow you to send your mail out to your intended recipients. Should the 20 minutes pass, the server no longer recognizes who you are and will need to verify security again using the incoming mail server.
The issue starts when email clients (such as Outlook) have an option set to send messages immediately. When you send a message immediately, your email program skips the authentication (verification) process and tries to send without receiving. If this happens after the 20 minute gateway closes, the server gets stuck because it has no idea which user is sending this email. It then stops, and says (not literally), "I do not know you; therefore, I will not let your mail through".
Basically, "553, Sorry, that domain isn't in my list of allowed rcpthosts" means that the server is not recognizing you.
So what are some ways to avoid this? We have two easy methods (A and B) to stop this from happening in Outlook and Outlook Express.
A. Click Send/Receive before composing an email. This way, you have 20 minutes to send the email and will not see the error.
B. (Recommended) You can tell the email client NOT to send messages immediately. This is the recommended method. This way, you compose a message, take as long as you need, click send, and when you're ready to send it out, click Send/Receive.
MicroSoft OUTLOOK:
- Open Outlook
- Click on Tools and choose Options
- Click the Mail Setup Tab
- Uncheck "Send Immediately When Connection"
- Click OK and make sure the Outbox is empty.
- Close Outlook and open it once more.
- From this point on, you should no longer see this error.
MicroSoft OUTLOOK EXPRESS:
- Open Outlook Express
- Click on Tools and choose Options
- Click the SEND Tab
- Uncheck "Send Messages Immediately"
- Click OK and make sure the Outbox is empty.
- Close Outlook Express and open it once more.
- From this point on, you should no longer see this error.
If you are using a program other than Outlook and see this error, please contact the manufacturer for ways to configure their email client to do the same in order to avoid the error.
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