I had this Warning with mxtoolbox. I know that it's not necessarily a big problem, but since we are having lots of issue with email delivery, I want to check everything.
I have a Exchange server 07 + Sonicwall.
My FQDN is office.mydomain.ca for send/receive connectors. When I try : telnet office.mydomain.ca 25 --> 220 MYSERVER.mydomain.local Microsoft ESMTP MAIL Service ready at Fri, 7 May 2010 10:34:36 -0400
I can change my SMTP Banner in the Sonicwall, but I don't know what to write, if there is a specific syntax or what can be the consequence if it doesn't work.
Thanks for your help.
edit: Here's the result for the SMTP test:
220 emailsecurity.mydomain.ca ESMTP SonicWALL (188.8.131.5241)
Not an open relay.
0 seconds - Good on Connection time
0.296 seconds - Good on Transaction time OK - xxx.xxx.xxx.xxx resolves to
Warning - Reverse DNS does not match SMTP Banner
250 emailsecurity.mydomain.ca [78 ms]
MAIL FROM: email@example.com
250 2.1.0 MAIL ok [62 ms]
RCPT TO: firstname.lastname@example.org
550 5.7.1 Unable to relay for [78 ms]
QUIT 221 2.0.0 Bye [62 ms]