I can send email to client-x, but the client-x can't send us your email.
The client-x receive an email error with the following message:
"553 sorry, your HELO host name has been denied (#5.7.1)"
My mail server is qmail (1.03 version) on Red Hat Enterprise Linux Server release 5.
The client-x have Microsoft Exchange and Sophos Email Appliance
The Email Appliance is an appliance for filtering email.)
The /var/qmail/control/badhelo file on my server doesn't have extdomain.com. For me, extdomain.com is not a badhelo.
Seven month ago I installed qmail-103.patch from http://www.ckdhr.com/ckd/qmail-103.patch
# patch -p1 < qmail-103.patch
# make setup check
I don't know if I need install another patch for qmail to resolve this problem.
I did the following test from my server :
[root@srv ~]# telnet mail.mydomain.com 25
Connected to mail.mydomain.com.
Escape character is '^]'.
220 mail.mydomain.com ESMTP
250 AUTH LOGIN PLAIN CRAM-MD5
RCPT TO:email@example.com NOTIFY=success,failure
553 sorry, your HELO host name has been denied (#5.7.1)
I omitted the real domains and IP addresses for confidentiality.
I can send to everybody emails, I can receive a lot of emails, but I can't receive emails from client-x.
Someone can give me an idea of what I should do.
Thanks so much.