DNS issue

[Mohamed_kamal]

i have fortimail 200d and fortigate 200D

when i send any mail replay me postmaster is (reason: 550 *** The HELO for IP address 41.38.52.75 was '[41.38.52.75]' (valid but not recommended syntax )

i contact with senderbase team to know why added my IP to blacklist and replay me that 

To this end, we are seeing reports of HELO strings which do not match the PTR / rDNS of the IP. One of the HELO string we are seeing  “[41.38.52.75]”  which is not exact matches to the PTR of the IP 41.38.52.75  (mail.elashrygroup.com).

how to resolve ip to HELO  ? 

please  help me 

[Bromont_FTNT]

When you edit your domain (Mail Settings ---> Domains) What do you have set under Advanced --> SMTP Greeting?

[Mohamed_kamal]

use system host name

[ede_pfau]

It looks like your DNS is not set up correctly.

When creating a A record ('mail.bla.com  1.2.3.4') a PTR record is required for reverse lookup ('1.2.3.4 -> mail.bla.com'). The reverse zone is named '3.2.1.in-addr.arpa' and contains one PTR record for each A record in use. Could you check into that direction?

[Mohamed_kamal]

A Record & PTR Record thats right 

IP 41.38.52.75

mail.elashrygroyp.com

could you check again if any error ?

[emnoc]

Agreed you HELLO string does not match, check in your domain setup. If you  HELLO string does not match the  DNS lookup most ESA will drop the connect.

FWIW the forward and A and PTR is not  your problem in  this case. 

[Mohamed_kamal]

can you tell me hot to setup HELLO on my domain ?

[Bromont_FTNT]

Is your Fortimail set up in gateway or transparent mode?

[emnoc]

You have a system name set for the unit in the initial configuration but for each mail-protect domain you can use the system hostname in the extended hello or set the one you want. Regardless it needs a proper  DNS entry.

e.g ( see under my protected domain  in this jpg )

[Mohamed_kamal]

i check mark use host name