Error 550 on an address in Eudora

[Jerry38018]

I have added an address to my Eudora address book, and I get this message when I try to send mail: Can't send to. The server gives this reason: 550 5 1 1 Not our Customer." Now when the person's address was sent to me, as a part of a piece of mail to that person and myself, I "copied and pasted" the address into the address book. I thought I had it wrong when my "test mail" did not go, so I asked for it again. I had it correct. I use Eudora, and have not had this trouble with any other addresses. Today I sent mail, got the message. I went to Webmail and used the address, and the mail went through. Is there something in Eudora I should check? Last night I was able to send a piece of mail with this address as a part of it, and it went through OK. But today, no go. Thanks for any help you can give.

[Broni]

Does it happen with just that one particular address?

[Jerry38018]

To answer the question, yes. However, I think somehow the address in the book was corrupt. I found that if I typed the address into the e-mail, or if I replied to an e-mail from that address, the mail went through. I decided to delete the address and re-enter it, and from then on I have had no trouble. I have no idea what would have happened to make it bad, as it was letter by letter the same, but something did it. Thanks so much for replying.

[Broni]

I'm glad, you fixed it