problem with RDNS

[rout3rx]

Hi
i have a PTR record and RDNS works for me but when i want sending email to this server : 62.152.169.25 error occurs and mail undelivery received.

qmail: 1403506829.587606 delivery 2978: failure: 62.152.169.25_does_not_like_recipient./Remote_host_said:_550_Invalid_RDNS_entry_for_144.76.245.38/Giving_up_on_62.152.169.25./

 

[InderS]

Hello,

Check your Reverse Lookup through : http://mxtoolbox.com/ReverseLookup.aspx

 

[rout3rx]

yes i checked it, returned:
PTR 144.76.245.38 mail.iasco.ir 24 hrs

 

[rout3rx]

i switched to postfix and email sent successfully! but some emails failed. why?