User unknown in relay recipient table

Help with Setup/Upgrade
1

Hi,

Have searched the forum but can’t find an answer to my problem.

I’ve successfully installed mail-in-a-box and it works sending/receiving mails using the domain box.domain1.com. After that I added a user to another domain, user@domain2.com, and fixed all DNS-settings. All system status checks are now green for both domains.

It works fine sending mail from user@domain2.com, but when I try to send a reply from my desktop mail client (Thunderbird) I get this error:
“An error occurred while sending mail. The mail server responded: 5.1.1 user@domain2.com: Recipient address rejected: User unknown in relay recipient table.”

Now I can’t figure out what is wrong, since the recipient address is listed in the user list. Please give me some directions…

2

What SMTP server is your desktop mail client using? (The Mail-in-a-Box or something else?)

3

Is that user you are sending email to have a different username than “user@domain2.com”?

According to the answer @ Postfix: Recipient address rejected: User unknown in local recipient table, even though recipient domain is an external domain - Server Fault This can happen when postfix is receiving email for domain2.com but the users actual domain is domain2.tld (or domain2.local, etc, it’s just DIFFERENT than the actual domain name)

4

I’m using a different SMTP for my desktop mail client, so it’s another mail server that is reporting the error.

Update 1:
It does work for the account user@domain2.com to mail itself. Also I could send a mail to the account from my gmail-account, so it might be my other SMTP (used it for years) that is doing something strange.

Update 2:
Finally solved it. The problem was that the SMTP I was sending with belonged to the same ISP where I had my old DNS-settings for the domain (before changing the name server). The SMTP used those old settings instead of recognizing the new name server (mail-in-a-box). It turned out that all other SMTPs except my own could send mails to the account.

Thanks for all help. Hope this might point someone else in the same direction.

5

Yes, it’s a valid mail account on mail-in-a-box. All system status checks are ok for the domain. I just anonymized it.

Will need to look closer at the link you supplied. Wasn’t obvious to me right away…

6

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