sendmail via linux problem

[TT2]

gang, I'm hoping someone can shed some light on this issue I am sending e-mails out via sendmail on linux. Whats really strange is that I can send to some outside addresses and not others. I have made many changes to etc/hosts and sendmail.cf with the same results. The specific error i am getting is the famous 550 5.1.8 invalid/host-not-in-DNS. Now my question is why shouldn't this fail for everyone? And what changes need to be made and where to insure mail can get out to any outside address? I'm really not sure if the (linux box) is the issue relaying or something else. Thanks for all responses as this has been very frustating.

TT2

 

[Fleabags]

TT2

I had a similar problem with Linux about 1 week ago. The fix I used was to configure my email clients pop3 and smtp server the same way, instead of using the ISP’s smtp address.

Example:
pop3- mail.domain.com
smtp- mail.domain.com

This fixed the problem I had.

Fleabags