Code: Select all
Aug 25 04:10:01 mx postfix/postscreen[98763]: CONNECT from [167.89.98.220]:49316 to [X.X.X.X]:25
Aug 25 04:10:07 mx postfix/postscreen[98763]: PASS OLD [167.89.98.220]:49316
Aug 25 04:10:07 mx postfix/smtpd[98777]: warning: hostname o1.vip.wpforms.com does not resolve to address 167.89.98.220: Name or service not known
Aug 25 04:10:07 mx postfix/smtpd[98777]: connect from unknown[167.89.98.220]
Aug 25 04:10:07 mx postfix/smtpd[98777]: NOQUEUE: reject: RCPT from unknown[167.89.98.220]: 450 4.7.25 Client host rejected: cannot find your hostname, [167.89.98.220]; from=<bounces+301-18d7-myemail=mydomain.com@em3794.ooma.com> to=<myemail@mydomain.com> pro$
Aug 25 04:10:08 mx postfix/smtpd[98777]: lost connection after RCPT from unknown[167.89.98.220]
Aug 25 04:10:08 mx postfix/smtpd[98777]: disconnect from unknown[167.89.98.220] ehlo=2 starttls=1 mail=1 rcpt=0/1 commands=4/5
Code: Select all
root@mailserver:~$ nslookup
> o1.vip.wpforms.com
Server: X.X.X.X
Address: X.X.X.X#53
** server can't find o1.vip.wpforms.com: NXDOMAIN
> 167.89.98.220
220.98.89.167.in-addr.arpa name = o1.vip.wpforms.com.
Authoritative answers can be found from:
>