ASA with exhange server problem

[mohamed.fawzy2012]

i installed asa to publish exchange server and it is working fine , but there is problem they cann't send mail to domain host in linkdotnet company ( ISP company ) and any domain host with linkdotnet isp doesn't work and there is error msg appear "421 4.4.0 remote server response was not rfc conformant"

[mvsheik123]

Hi Mohammed,

Check if the below link helps with your issue...

https://social.technet.microsoft.com/Forums/en-US/aca4759d-5baf-4e7c-a6b5-ab5528a8e8c6/421-440-remote-server-response-was-not-rfc-conformant?forum=exchangesvrsecuremessaginglegacy

hth

MS

[mohamed.fawzy2012]

hi mvsheik ,

this link is not helpful , i tried to put dns of ISP on exchange server but also still the problem not solved.

br,

mohamed fawzy