When I try to send an e-mail from my rh7.1 server using sendmail version 8.11 I get the following error message.
<<< 220 imsmq09.netvigator.com ESMTP
>>> EHLO rose.kjs.edu.hk
<<< 250 8BITMIME
>>> MAIL FROM:<email@example.com>
<<< 250 ok
>>> RCPT TO:<firstname.lastname@example.org>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
<<< 250 flushed
<<< 221 imsmq09.netvigator.com
Receiving mail is not a problem. We have recently changed ISPs from Netvigator to HGC and I notice the error message mentions that it is still trying to send messages through the old ISP (Netvigator). I have had a look at sendmail.cff but it does not mention netvigator anywhere. Thanks for your time.